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ojc123
Feb 19, 2012, 09:24 AM
I really need help removing mountain lion dev preview 1. its crashing everything... Please help



simsaladimbamba
Feb 19, 2012, 09:26 AM
You do need to do a clean install from the 10.7 recovery partition.
The following guide is for 10.6, but the same rules apply for 10.7 once you have booted from the Lion recovery partition.
To create a Clean Install (formerly known as Erase & Install) of Mac OS X 10.6 Snow Leopard (the 29 USD Upgrade DVD is a fully working retail version of Mac OS X and does not need a prior installation of Mac OS X on the Mac), follow one of the following guides:

Short version: Clean Install of OS X 10.6 Snow Leopard (http://guides.macrumors.com/Clean_Install_of_OS_X_10.6_Snow_Leopard)
Long version: Mac OS X v10.6 Snow Leopard: How to Erase and Install (http://support.apple.com/kb/ht3910)


OS X Lion: About Lion Recovery (http://support.apple.com/kb/HT4718)
Lion Recovery Disk Assistant (http://support.apple.com/kb/dl1433)


I guess, you haven't backed up anything before installing OS X 10.8 Mountain Lion?

ojc123
Feb 19, 2012, 09:29 AM
You do need to do a clean install from the 10.7 recovery partition.
The following guide is for 10.6, but the same rules apply for 10.7 once you have booted from the Lion recovery partition.
To create a Clean Install (formerly known as Erase & Install) of Mac OS X 10.6 Snow Leopard (the 29 USD Upgrade DVD is a fully working retail version of Mac OS X and does not need a prior installation of Mac OS X on the Mac), follow one of the following guides:

Short version: Clean Install of OS X 10.6 Snow Leopard (http://guides.macrumors.com/Clean_Install_of_OS_X_10.6_Snow_Leopard)
Long version: Mac OS X v10.6 Snow Leopard: How to Erase and Install (http://support.apple.com/kb/ht3910)


OS X Lion: About Lion Recovery (http://support.apple.com/kb/HT4718)
Lion Recovery Disk Assistant (http://support.apple.com/kb/dl1433)


I guess, you haven't backed up anything before installing OS X 10.8 Mountain Lion?

i back up all the time, but the recovery partition is for mac osx 10.8 not 10.7. so how do i get the 10.7 recovery back

simsaladimbamba
Feb 19, 2012, 09:41 AM
i back up all the time, but the recovery partition is for mac osx 10.8 not 10.7. so how do i get the 10.7 recovery back

How do you backup? Time Machine or a clone?

And have you deleted the Mac OS X 10.7 Lion recovery partition? Normally when one installs OS X 10.8 Mountain Lion on a Mac with a Mac OS X 10.7 Lion recovery partition, one has two recovery partitions and two OS X partitions.


____________________________________________________________

Maybe have a look at Advanced Search (http://forums.macrumors.com/search.php) to find many similar threads about downgrading from OS X 10.8 Mountain Lion to Mac OS X 10.7 Lion:
http://dl.dropbox.com/u/10644330/MR_Image_Hotlinks/MR_screenshots/MR_screenshots_2011_11/2011_11_02_pB1_MR_advSearch_small.png (http://dl.dropbox.com/u/10644330/MR_Image_Hotlinks/MR_screenshots/MR_screenshots_2011_11/2011_11_02_pB2_MR_advSearch.png)
____________________________________________________________

ojc123
Feb 19, 2012, 09:43 AM
How do you backup? Time Machine or a clone?

And have you deleted the Mac OS X 10.7 Lion recovery partition? Normally when one installs OS X 10.8 Mountain Lion on a Mac with a Mac OS X 10.7 Lion recovery partition, one has two recovery partitions and two OS X partitions.


____________________________________________________________

Maybe have a look at Advanced Search (http://forums.macrumors.com/search.php) to find many similar threads about downgrading from OS X 10.8 Mountain Lion to Mac OS X 10.7 Lion:
Image (http://dl.dropbox.com/u/10644330/MR_Image_Hotlinks/MR_screenshots/MR_screenshots_2011_11/2011_11_02_pB2_MR_advSearch.png)
____________________________________________________________


im use time machine, and the only recovery partition is 10.8, i didnt delete the other one it seems as if this one has replaced it

simsaladimbamba
Feb 19, 2012, 09:47 AM
im use time machine, and the only recovery partition is 10.8, i didnt delete the other one it seems as if this one has replaced it

Lion Internet Recovery

If you happen to encounter a situation in which you cannot start from the Recovery HD, such as your hard drive stopped responding or you installed a new hard drive without Mac OS X installed, new Mac models introduced after public availability of OS X Lion automatically use the Lion Internet Recovery feature if the Recovery HD (Command-R method above) doesn't work. Lion Internet Recovery lets you start your Mac directly from Apple's Servers. The system runs a quick test of your memory and hard drive to ensure there are no hardware issues.

Lion Internet Recovery presents a limited interface at first, with only the ability to select your preferred Wi-Fi network and, if needed, enter the WPA passphrase. Next, Lion Internet Recovery will download and start from a Recovery HD image. From there, you are offered all the same utilities and functions described above.

As with the Recovery HD, reinstallation of OS X Lion from Lion Internet Recovery requires an Internet connection. See "Supported network configurations and protocols" below.

Some computers that did not ship with OS X Lion installed may have a software update available that allows them to use Lion Internet Recovery.

from OS X Lion: About Lion Recovery (http://support.apple.com/kb/HT4718)

ojc123
Feb 19, 2012, 09:53 AM
from OS X Lion: About Lion Recovery (http://support.apple.com/kb/HT4718)

unfortunately that has also failed as it redirects to the 10.8 recovery

simsaladimbamba
Feb 19, 2012, 09:55 AM
unfortunately that has also failed as it redirects to the 10.8 recovery

Do you have access to any other Mac with Mac OS X 10.7 Lion?

ojc123
Feb 19, 2012, 10:01 AM
Do you have access to any other Mac with Mac OS X 10.7 Lion?

unfortunately not, i do however have snow leopard install disks

simsaladimbamba
Feb 19, 2012, 10:07 AM
unfortunately not, i do however have snow leopard install disks

Did your Mac come with Mac OS X 10.6 Snow Leopard?
If so, you can do the clean install that way and later re-download Mac OS X 10.7 Lion and install it.

ojc123
Feb 19, 2012, 10:08 AM
Did your Mac come with Mac OS X 10.6 Snow Leopard?
If so, you can do the clean install that way and later re-download Mac OS X 10.7 Lion and install it.

yes it came with snow leopard.

will my latest time machine backup work though?

simsaladimbamba
Feb 19, 2012, 10:10 AM
yes it came with snow leopard.

will my latest time machine backup work though?

Yes, it will work with your personal files and settings.

ojc123
Feb 19, 2012, 10:15 AM
Yes, it will work with your personal files and settings.

So I boot from the osx install disk?

simsaladimbamba
Feb 19, 2012, 10:18 AM
So I boot from the osx install disk?

Yes, just follow one of the two clean install guides in post #2.

maril1111
Feb 19, 2012, 10:20 AM
So I boot from the osx install disk?

yes exactly

Nielsenius
Feb 19, 2012, 10:33 AM
I attempted to downgrade from 10.8 to 10.7 yesterday. I failed miserably. I believe that 10.8 upgrades the EFI firmware (on the logic board). I believe this is the case because the boot menu (hold alt at chime) has an added "Select Network" option. I could not boot into 10.7. I could only boot to 10.8 and Windows. Anybody telling this guy to "just boot from install disk" doesn't know what they're talking about in this situation. I tried reinstalling Lion three times! Never was I successful in getting Lion to boot (both Time Machine restore and fresh install from DVD).

I think the only way to successfully downgrade from 10.8 to 10.7 is to download the latest EFI firmware update from http://support.apple.com/downloads/ and update the firmware manually through 10.8 and then downgrade via backup or fresh install. This is only a theory (I'm sticking with 10.8 for now).

roadbloc
Feb 19, 2012, 05:45 PM
And this is why Mountain Lion is a Developer Preview.

Partron22
Feb 19, 2012, 06:00 PM
I'm not having any trouble booting my choice of 10.6, 10.7, or 10.8.
I've got a "Recovery HD" on my 10.7 drive, and on my 10.8 drive. I suppose it's possible that the two having the same name could cause problems if you try to put them both on the same physical disk.

carbonfly
Feb 19, 2012, 06:40 PM
What exactly is it that is crashing? Not many other people are complaining about significant amounts of crashes.

vcantrell
Feb 19, 2012, 10:03 PM
What exactly is it that is crashing? Not many other people are complaining about significant amounts of crashes.

I just thought I'd throw it out there as a systems administrator and app developer, after expirementing with DP1 on a trial computer for an extended period of time, I thought it stable enough to try on my MBP as well. All in all it was very stable, being that they didn't redesign the core of the OS I wasn't expecting a whole lot of problems. One major thing I did notice is that for some reason java was completely broken in chrome. No matter how many complete reinstalls of chrome or java I did, it wouldn't recognize.

As for the downgrading question from time machine......

I tried SO many things and all seemingly failed. It wouldn't downgrade no matter what I did. Here are the steps I had to take to make the downgrade successful:

1. I burned a flash drive copy of lion (full so that I didn't have to download it... they exist.) and booted off that. I completely reformatted the Macintosh HD and reinstalled on that.
2. After it succeeded, I booted and ran updates including EFI and Recovery HD updates. I then rebooted and booted to the newly repaired Recovery HD.
3. I chose to restore from time machine and chose my latest backup. After it 'completed', it rebooted but just hung on the boot screen as has been a problem with time machine complete restores.
4. I booted off my lion flash drive again and chose to reinstall lion on Macintosh HD, this time without using disk utility to reformat it first.
5. After the reinstall completed, it rebooted and my OS was with the successful time machine restore.
6. I had to run updates back to 10.7.3... but other than that everything appears to be normal.

Thought I'd share for anyone struggling with this.

brendu
Feb 19, 2012, 10:33 PM
I am not sure if you can do a time machine backup in snow leopard using a backup created in lion. Also, if you got Mountain Lion, you should pretty easily be able to re-download the Lion install since you have a developer license. Just download that and create an install DVD with it.

Thats all presuming the firmware issue doesn't prevent you. I am not sure about that.

old-wiz
Feb 19, 2012, 10:53 PM
Here we go...

I hate it when people who don't know what they are doing fool around with betas and developer previews and then come screaming here when something goes wrong, very wrong.

simsaladimbamba
Feb 19, 2012, 10:55 PM
I hate it when people who don't know what they are doing fool around with betas and developer previews and then come screaming here when something goes wrong, very wrong.

But that is the human condition. Curiosity and ignorance almost always go hand in hand, strangely enough.

Krazy Bill
Feb 19, 2012, 11:22 PM
This happens with every developer release. :D

Why on god's good earth would anyone throw a beta OS onto a perfectly working system? :eek:

vcantrell
Feb 20, 2012, 08:24 AM
This happens with every developer release. :D

Why on god's good earth would anyone throw a beta OS onto a perfectly working system? :eek:

And that's Your opinion. Mine on the other hand, is this:

The only reason I got to where I am today after 4 years in a computing program and all the way through my masters is because when I was a kid I took the time to screw up my system. I was constantly breaking this or that, whether it be on Mac, PC, or some flavor of linux. What made me great at IT support and systems administration was that I knew how to navigate problems and fix things others didn't. It was for that reason I installed on my main laptop as well, because I knew that if it Was stable enough, great. If not, I'd have a challenge getting my time machine to restore back. Granted with the simplicity Apple usually puts into their products I didn't expect to have This much of an issue with time machine, but at the end of the day I'm back on 10.7.3 running an image from friday.

So judge all you want, but some of us have methods to our madness :cool:

Partron22
Feb 20, 2012, 08:38 AM
There is something to be said for deliberately stepping into the abyss, confident that, if you need to, you can fight your way back out. However, for most people, Mountain Lion beta is an excellent excuse to finally buy that extra hard drive you've been meaning to get for years.

yordan.i.ivanov
Feb 26, 2012, 02:36 AM
Hey all
As a dev and app designer AND just a basic user when it comes to my personal computers (go figure) I can say the 10.8 is behaving VERY very good for a dev1 beta OS

1. Why we throw a beta OS to a working system? Because of curiosity - we want to explore more and more and most of us have no patience.

2. Why that particular person is having so much issues? Most probably he is JUST a basic user and installed from a pirate tracker and wonders why nothing is working after having throw everything possible inside and thinkered the system until it looked like linux or Windows!!!! (he does have windows installed on one partition)

3. My personal belief is that this version so far despite its problems with Flash, Java certain crashes of programs, hungs and critical errors I encountered is working pretty well :) :) :) I am satisifed - the only thing I find not really working is the Notification Center (as a new feature) and also the AirPlay requires you to update your ATV2 to a beta version as well which would possibly mean all devices too WHICH I find to be rather annoying although I can understand the logic in it.



Furthermore I am also currently installing Windows as I need it to run some WinOS programs and I only have a Mac as portable but hey I dont mind reinstalling from scratch anyways.



Has anyone noticed other issues in the stability or maybe some fixes like Mail and Safari incompatibilities?


All the best from me and remember ojc123/macrumors newbie



The most important thing in IT is Backup, Backup, Backup



Friday is a backup day




bye

throAU
Feb 26, 2012, 03:06 AM
This is why you try out developer previews of operating systems in VMware or Virtualbox. :)

Cougarcat
Feb 26, 2012, 05:19 PM
However, for most people, Mountain Lion beta is an excellent excuse to finally buy that extra hard drive you've been meaning to get for years.

Terrible time to buy hard drives now, though.

JUiCEJamie
Feb 26, 2012, 05:24 PM
Didn't you create a partition to test it on?

Cartmans Friend
Feb 27, 2012, 09:55 AM
To those who need help getting Mountain Lion off of that Mac you just installed it on, here is what I did to get this done(Yes, I was one of those idiots who blindly upgraded my base OS..) :-)

1. Create a Lion bootable USB drive http://osxdaily.com/2011/07/08/make-a-bootable-mac-os-x-10-7-lion-installer-from-a-usb-flash-drive/

2. Follow instructions and when prompted to install Lion from the USB drive, first go into disk utilities and erase the Mac Hard Drive OS partition (Not the recovery partition even though its now 10.8 anyhow..lol) and run the Lion installer. It should install Lion clean.

3. Boot up into Lion and re-run your patch/updates(as well as re-creating your 10.7 recovery partition which the patching process should do)and when you get to your previous patch level of Lion before you upgraded to ML, you can run Time Machine to restore your junk(or copy/reinstall your junk from an external drive).

This worked for me and I am back on Lion with all my junk with no problems.
Key here is that you can downgrade...There is a way back. lol

:):D:cool::apple:

creeman
Feb 27, 2012, 10:15 PM
To those who need help getting Mountain Lion off of that Mac you just installed it on, here is what I did to get this done(Yes, I was one of those idiots who blindly upgraded my base OS..) :-)

1. Create a Lion bootable USB drive http://osxdaily.com/2011/07/08/make-a-bootable-mac-os-x-10-7-lion-installer-from-a-usb-flash-drive/

2. Follow instructions and when prompted to install Lion from the USB drive, first go into disk utilities and erase the Mac Hard Drive OS partition (Not the recovery partition even though its now 10.8 anyhow..lol) and run the Lion installer. It should install Lion clean.

3. Boot up into Lion and re-run your patch/updates(as well as re-creating your 10.7 recovery partition which the patching process should do)and when you get to your previous patch level of Lion before you upgraded to ML, you can run Time Machine to restore your junk(or copy/reinstall your junk from an external drive).

This worked for me and I am back on Lion with all my junk with no problems.
Key here is that you can downgrade...There is a way back. lol

:):D:cool::apple:

I did this and it worked. Mostly. I say mostly because now every time I try and launch the Mail.app it crashes instantly. I had mountain lion for a couple of days and my Time Machine did back it up a couple times, so I think that when I restored my data from my Time Machine back onto Lion it copied over the Mail.app from ML. Anyways, it doesn't work now so who knows.

ac3320
Feb 28, 2012, 11:11 PM
I attempted to downgrade from 10.8 to 10.7 yesterday. I failed miserably. I believe that 10.8 upgrades the EFI firmware (on the logic board). I believe this is the case because the boot menu (hold alt at chime) has an added "Select Network" option. I could not boot into 10.7. I could only boot to 10.8 and Windows. Anybody telling this guy to "just boot from install disk" doesn't know what they're talking about in this situation. I tried reinstalling Lion three times! Never was I successful in getting Lion to boot (both Time Machine restore and fresh install from DVD).

I think the only way to successfully downgrade from 10.8 to 10.7 is to download the latest EFI firmware update from http://support.apple.com/downloads/ and update the firmware manually through 10.8 and then downgrade via backup or fresh install. This is only a theory (I'm sticking with 10.8 for now).

I agree. I couldn't downgrade when I tried to because the Lion installer kept giving me "Can't download additional components" etc. My internet connection was fine.

dthoang65536
Feb 29, 2012, 03:14 PM
I boot up my macbook air with LM pressing the Option button. There is option Mac OS X beside other like 10.8 Recovery HD and Mountain Lion 10.8, but when I go in to that option, it shows up a circle with a slash meaning something is wrong. Does anyone have any suggestion for this. Is this because of the Lion version in my USB thumb drive?
I'll appreciate any suggestion.

GermanyChris
Mar 1, 2012, 03:03 AM
I attempted to downgrade from 10.8 to 10.7 yesterday. I failed miserably. I believe that 10.8 upgrades the EFI firmware (on the logic board). I believe this is the case because the boot menu (hold alt at chime) has an added "Select Network" option. I could not boot into 10.7. I could only boot to 10.8 and Windows. Anybody telling this guy to "just boot from install disk" doesn't know what they're talking about in this situation. I tried reinstalling Lion three times! Never was I successful in getting Lion to boot (both Time Machine restore and fresh install from DVD).

I think the only way to successfully downgrade from 10.8 to 10.7 is to download the latest EFI firmware update from http://support.apple.com/downloads/ and update the firmware manually through 10.8 and then downgrade via backup or fresh install. This is only a theory (I'm sticking with 10.8 for now).

really can't go back huh, I went from 10.8 back to 10.6.8 with the install disks..

I think it's you who doesn't know what their talking about..

@OP This is a DP the expectation is that developers will not a: install it as their main OS or b: be able to fix things when/if they go wrong

Meetster
Mar 5, 2012, 10:54 AM
I have a lot of problems with Mountain Lion. Even if it's a Preview this is ****. I get slow boot up times, it crashes a lot, safari is acting like a bitch (if theres html5 elements the screen flickers from time to time but only in the safari window) then sometimes after 5-10 minutes i cant enter anything in URL bar. The Screensaver doesnt wake up sometimes when i click or press ESC, the laptop doesnt shut down sometimes, the laptop gets hotter as before when doing nothing, its slow with starting, a lot of apps doesnt work right (start and then close 2-3 seconds after it) iMessage is a pice of crap ******** which doesnt work right with icloud. the password remember thingy of safari is bugged. etc etc its just a piece of crap... how can a preview of a better newer version be like 3942387 times worse than the before version???

old-wiz
Mar 5, 2012, 02:05 PM
I have a lot of problems with Mountain Lion. Even if it's a Preview this is ****. I get slow boot up times, it crashes a lot, safari is acting like a bitch (if theres html5 elements the screen flickers from time to time but only in the safari window) then sometimes after 5-10 minutes i cant enter anything in URL bar. The Screensaver doesnt wake up sometimes when i click or press ESC, the laptop doesnt shut down sometimes, the laptop gets hotter as before when doing nothing, its slow with starting, a lot of apps doesnt work right (start and then close 2-3 seconds after it) iMessage is a pice of crap ******** which doesnt work right with icloud. the password remember thingy of safari is bugged. etc etc its just a piece of crap... how can a preview of a better newer version be like 3942387 times worse than the before version???

It is a developer version! NOT a release version. You are expecting too much. Besides, you are a developer, right? So you have another system to work on right? So you are a registered Apple developer, right? The point of a developer preview is to test YOUR software on the new OS version, isn't it? And Apple developers have their own forum to report problems.

simsaladimbamba
Mar 5, 2012, 02:15 PM
I have a lot of problems with Mountain Lion. Even if it's a Preview this is ****. I get slow boot up times, it crashes a lot, safari is acting like a bitch (if theres html5 elements the screen flickers from time to time but only in the safari window) then sometimes after 5-10 minutes i cant enter anything in URL bar. The Screensaver doesnt wake up sometimes when i click or press ESC, the laptop doesnt shut down sometimes, the laptop gets hotter as before when doing nothing, its slow with starting, a lot of apps doesnt work right (start and then close 2-3 seconds after it) iMessage is a pice of crap ******** which doesnt work right with icloud. the password remember thingy of safari is bugged. etc etc its just a piece of crap... how can a preview of a better newer version be like 3942387 times worse than the before version???

Really? As old-wiz pointed out in clear words, it is a Preview, it is like a beta, not a full release where stability is promised. It is for developers, the ones that write software you may take for granted, to test their applications with and report to Apple all the bugs they find, thus Apple can iron them out.
A Preview is not for everyday users. But then again, I like it, when people without knowledge tarnish their systems with a beta they acquired illegally.

And if you were a developer, you would have known better. Ah.

afin
Mar 5, 2012, 03:15 PM
And if you were a developer, you would have known better. Ah.

If they were an actual developer they would know better, but clearly their ailment is more that they lack any common sense and were foolish enough to just go right ahead and throw a preview over their existing setup.

old-wiz
Mar 5, 2012, 06:29 PM
If they were an actual developer they would know better, but clearly their ailment is more that they lack any common sense and were foolish enough to just go right ahead and throw a preview over their existing setup.

and probably a pirated preview as well.

east85
Mar 5, 2012, 07:23 PM
So are people actually having this issue when properly partitioning their HDD? I don't get it? Is it somehow dangerous to test ML on a partition? Or are people actually just trying to upgrade their existing main operating system already?

simsaladimbamba
Mar 5, 2012, 07:26 PM
So are people actually having this issue when properly partitioning their HDD? I don't get it? Is it somehow dangerous to test ML on a partition? Or are people actually just trying to upgrade their existing main operating system already?

It is not dangerous to use OS X 10.8 Mountain Lion on a separate partition or HDD, but mostly users downloading OS X 10.8 Mountain Lion are just upgrading their Mac OS X 10.7 Lion installation without backing it up before the upgrade. That is the main source of problems, as those users don't seem to know how OS installations work and how to take steps in case something goes wrong, like backups and such.

ac3320
Mar 5, 2012, 07:28 PM
It is not dangerous to use OS X 10.8 Mountain Lion on a separate partition or HDD, but mostly users downloading OS X 10.8 Mountain Lion are just upgrading their Mac OS X 10.7 Lion installation without backing it up before the upgrade. That is the main source of problems, as those users don't seem to know how OS installations work and how to take steps in case something goes wrong, like backups and such.

Maybe, but I backed everything up and that is not the source of my problem, as you seem to imply. My problem is that something happens when trying to re-clean install 10.7 or even 10.6 again, and that is that the installer always fails at the "Can't download additional components..."

simsaladimbamba
Mar 5, 2012, 07:35 PM
Maybe, but I backed everything up and that is not the source of my problem, as you seem to imply. My problem is that something happens when trying to re-clean install 10.7 or even 10.6 again, and that is that the installer always fails at the "Can't download additional components..."
Using a 10.6 DVD should provide with the ability to erase the internal HDD and reinstall Mac OS X 10.6 Snow Leopard.
With 10.7 it might be more complicated due to the missing installation medium provided by Apple, that one can "only" use Internet Recovery if one doesn't have a 10.7 installer on a DVD or USB flash memory thumb drive.
When I bought 10.7 I created an installer on a USB flash memory thumb drive using CarbonCopyCloner (http://www.bombich.com) and I also stored the DMG for future purposes.
Just yesterday I cloned the DMG to another HDD partition to have a bootable installer (I have made an external HDD with ten partitions, four partitions to house all the installers from 10.5 to 10.8m four partitions to house all Mac OS X versions from 10.5 to 10.8 and one partition for mobile backups and one partition for application installers - I did this to have a mobile troubleshooting HDD when visiting clients), and it worked perfectly.

Maybe it is a firmware issue, did your Mac come with Mac OS X 10.6 Snow Leopard or Mac OS X 10.7 Lion?

ac3320
Mar 5, 2012, 07:44 PM
Using a 10.6 DVD should provide with the ability to erase the internal HDD and reinstall Mac OS X 10.6 Snow Leopard.
With 10.7 it might be more complicated due to the missing installation medium provided by Apple, that one can "only" use Internet Recovery if one doesn't have a 10.7 installer on a DVD or USB flash memory thumb drive.
When I bought 10.7 I created an installer on a USB flash memory thumb drive using CarbonCopyCloner (http://www.bombich.com) and I also stored the DMG for future purposes.
Just yesterday I cloned the DMG to another HDD partition to have a bootable installer (I have made an external HDD with ten partitions, four partitions to house all the installers from 10.5 to 10.8m four partitions to house all Mac OS X versions from 10.5 to 10.8 and one partition for mobile backups and one partition for application installers - I did this to have a mobile troubleshooting HDD when visiting clients), and it worked perfectly.

Maybe it is a firmware issue, did your Mac come with Mac OS X 10.6 Snow Leopard or Mac OS X 10.7 Lion?

I made a bootable flash drive like all the other smart/nerdy people, so that's not really an extra pole to jump over.

In regards to firmware: that's exactly right -- i believe it is a firmware issue! I am only posting in this thread so that the guys who idiotically updated to 10.8 without a backup don't feel so stupid. In other words, it lends itself to being empathetic instead of apathetic in regards to their plight!

I can clean install 10.6 using a hard drive with multiple partitions for tech purposes (it has 10.5.5, 10.6, 10.7, and 10.8 DP1). But when I try to clean install 10.7, i cannot. Similarly, if I try to lame-o upgrade install 10.7 from 10.6 -- from the MAS lion app -- i get the same error message when trying to clean install from my bootable flash drive. Note that I have re-downloaded a new copy of lion and re-DMG'd it onto my flash drive with the new copy. Flash Drive works fine; the lion app used to try the upgrade and as a source for the InstallESD.dmg are fine.

I truly believe something happened firmware wise when going to 10.8. No biggie, as it's not that buggy for me, except that a few apps are broken and some other stuff.

flowsy
Mar 6, 2012, 04:39 PM
No way to downgrade my MBA 2011 to 10.7 either. Firmware changed. Period. :rolleyes:

jfredsilva
Mar 26, 2012, 07:17 AM
I boot up my macbook air with LM pressing the Option button. There is option Mac OS X beside other like 10.8 Recovery HD and Mountain Lion 10.8, but when I go in to that option, it shows up a circle with a slash meaning something is wrong. Does anyone have any suggestion for this. Is this because of the Lion version in my USB thumb drive?
I'll appreciate any suggestion.

I have the same problem, did you find a way to make it work?

flowsy
Mar 26, 2012, 07:39 AM
This worked for me:

http://code.rawlinson.us/2012/02/rollback-from-mountain-lion-to-lion.html

:)


Edit: Just the "changing the version number" part. I then could start the Lion installer under 10.8.

merrickdrfc
Mar 27, 2012, 01:34 AM
I managed to downgrade my 2011 MacBook Air to 10.7.3 from 10.8 simply by restoring the OSXInstallESD.dmg from the 10.7.3 App Store download onto an external HDD. Booted from the External, wiped the SSD and then simply installed 10.7.3.

DoodlyDoo
Apr 19, 2012, 09:06 AM
If you can do a clean install of Lion, that will help.

Otherwise, just restore to your most recent Lion backup. Then, login as root and you can delete the account. Sometimes it will work and sometimes it won't.

If you did a clean install, just skip that last paragraph. Then open 'Migration Assistant' and do a restore from Time Machine Backup. Then recover your user account and settings. Just check all the boxes. Then after about 4 or 5 hours depending on if its a network drive or not. If it's directly connected to your Mac, it will obviously take less. Reboot. Then do all software updates and you're back on track.

I too have made the mistake of installing developer previews on my main system. Won't anymore.

hafr
Apr 19, 2012, 01:25 PM
Apparently this is one way of doing it: http://falkenmire.com/blog/2012/3/12/mountain-lion-to-lion-rollback.html

yearziro
Apr 19, 2012, 05:58 PM
Hopefully this is newb friendly enough and helps someone who needs its

I had the same issue ML killed my backup so i couldn't simply revert do to the kernel panic or whatever it was so what worked for me was doing the following

First as always backup any and all info you need...

1) goto utilities and then goto disk utility once there you should see on the left hand side of the disk utility window your hard drive (ie 500.11 GB toshiba etc) click on that then.

2)goto the tab that says partition and click on it you should have one visible partition even if you have a backup it wont be shown here so dont worry. (at least mine didn't even so you can also create a backup later which i recommend)

Once there click on the whole box which represents your partition at the bottom there are a + and - you wanna click the plus now create 3 partitions.

Make sure that on the right side of the disk utility window the partitions are formatted in the MAC OS Extended format not any of the others.

Also this is important one of these partitions need to be big enough to have a copy of OSX loaded you can resize them by yourself manually by simply clicking on the gaps and sliding them to your desired size…..so to be safe make it 30 GBs (name it something like Lion or whatever your installing

The others can be 5 a peice whatever its not that important.

Once your done with that click apply this might take awhile depending on your HD or computer so make sure the battery is plugged in and let it do its thing.

3)Ok now you should have 4 partitions on your drive one holding mountain lion and 3 others with nothing on them...

4)Now to go back to a previous version of OSX I used a copy of snow leopard since it was all i had but I'm sure lion will work fine so you will need one of those disks.

Insert the disc in your superdrive with mountain lion running once it recognizes the disk it should pop up now in the disk utility window in the section where your hard drive is as a little white box.

Next you need to goto the tab that says RESTORE click on that and over on the left side you should grab the osx file thats under supder drive and drag it to the SOURCE BOX if it jumps out drag it back once it stays then in the DESTINATION box drag in the partition you have made for lion or whatever and once thats there click restore.

your machine should now be installing a copy of OSX onto the specified drive feel free to use your machine while it does this.


Now if you did everything right you should have a stable version of OSX installed on your newly made partition and you can import all the stuff you backed up to this partition of OSX before you delete the others

And maybe learned your lesson about upgrading to beta software go back to disk utility and goto your hard drive again now highlight the partition with mountain lion and goto the erase tab

To start up your new partition simply restart your machine holding the option/alt key which will bring up a menu of partitions now select your lion/snow leopard whatever partition and double click that to boot into a stable version of OSX


****Lastly if you want to delete the mountain lion partition from your hard drive ****


(!!!MAKE SURE THIS IS THE MOUNTAIN LION PARTITION NOT THE LION OTHERWISE YOU WILL HAVE TO REPEAT EVERYTHING AGAIN!!!)

click erase and let it erase once again it might take some time make sure your battery is full or your plugged in once it gets deleted you should have the 4 partitions which now only one of them has anything on them you can delete the others and resize your hard drive into one or whatever you want to


If your still having trouble let me know and im willing to help anyone who needs more or doesn't understand something

ATC
Apr 19, 2012, 08:26 PM
And this is why Mountain Lion is a Developer Preview.

To be fair, you don't have to be a developer to have access to ML. I'm not a developer but I was invited into the AppleSeed program for both Lion and now ML.

Having said that, to the OP; you really need to be on the AppleSeed Discussion forums instead of here, which you would have access to if you got ML legitimately. All the resources you need are there. :cool:

KaraThrace
Jun 24, 2012, 07:57 AM
This happens with every developer release. :D

Why on god's good earth would anyone throw a beta OS onto a perfectly working system? :eek:

Clearly they have nothing better to do. I on the other hand did it fully expecting the worst. I was lucky, it wasn't bad until it started freezing (Im talking DP4 U1 here) then I just got jack of it and decided to revert back to 10.7.4. There were a few dramas there. Lets just say the password encryption system in 10.8 has changed dramatically... bingo bango... restoring Time Machine data (even without any computer settings) can seriously lock you out of your newly restored MBP. Heh, whodathunkit?

Happy to say its back up and running in virgin 10.7.4 right now though. Me SMRT.;)

jameslmoser
Jun 24, 2012, 06:57 PM
I was able to use the 10.8 recovery partition to restore Lion using a time machine drive. I know it was the 10.8 recovery partition because I deleted the lion recovery partition before I even installed Mountain Lion. I thought I was going to have to use the Lion install USB drive to restore my machine, but I didn't have to, it just worked.

I know when I tried to restore Snow Leopard using the Lion recovery partition though, that didn't seem to work for me.

lukekaz9
Jun 28, 2012, 08:53 PM
Just take a thumb drive and use disk utility to put mountain Lion on it.
Once you have a bootable mountain lion install thumb drive plug it in, hold option down while booting up and select it.
When it loads it should look exactly like the normal mountain lion recovery mode.
Now go to disk utility and erase the macs "Machintosh HD" hard drive completely.
Then load lion onto your thumb drive and boot up holding option and select it. Now install lion on your empty hard drive!

You will lose all your data... but it's not to hard to backup.

Only way I could find to do it.

Kimahski
Sep 10, 2012, 07:17 PM
I am hoping someone can help me. I have always backed up (to external drive) with time machine. I recently upgraded from snow leopard to mountain lion. It is not compatible with 50% of my programs and will not connect with my external Internet hard drive. I really need to revert to snow leopard. Can anyone help me? Thanks for any suggestions, :(

simsaladimbamba
Sep 10, 2012, 07:28 PM
I am hoping someone can help me. I have always backed up (to external drive) with time machine. I recently upgraded from snow leopard to mountain lion. It is not compatible with 50% of my programs and will not connect with my external Internet hard drive. I really need to revert to snow leopard. Can anyone help me? Thanks for any suggestions, :(

You do a clean install with your Snow Leopard installation medium, be it a grey Restore DVD (#1) or the 29 USD Upgrade DVD.

To create a Clean Install (formerly known as Erase & Install) of Mac OS X 10.6 Snow Leopard (the 29 USD Upgrade DVD is a fully working retail version of Mac OS X and does not need a prior installation of Mac OS X on the Mac), follow one of the following guides:

Short version: Clean Install of OS X 10.6 Snow Leopard (http://guides.macrumors.com/Clean_Install_of_OS_X_10.6_Snow_Leopard)
Long version: Mac OS X v10.6 Snow Leopard: How to Erase and Install (http://support.apple.com/kb/ht3910)

Kimahski
Sep 12, 2012, 08:39 AM
If I do a clean install will I lose all my apps? I did backup in time machine...

fritzio
Nov 4, 2012, 09:04 AM
You do a clean install with your Snow Leopard installation medium, be it a grey Restore DVD (#1) or the 29 USD Upgrade DVD...

Short version: Clean Install of OS X 10.6 Snow Leopard (http://guides.macrumors.com/Clean_Install_of_OS_X_10.6_Snow_Leopard)
Long version: Mac OS X v10.6 Snow Leopard: How to Erase and Install (http://support.apple.com/kb/ht3910)
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Thanks for this, simsaladimbamba, it saved my butt! So now, how do I get my refund from :apple:? :D

Icy1007
Nov 4, 2012, 10:09 AM
If I do a clean install will I lose all my apps? I did backup in time machine...

If you do a clean install, everything on the drive, including your apps, gets erased.

jeffreycollins
May 24, 2013, 03:53 PM
Do you have access to any other Mac with Mac OS X 10.7 Lion?

Nevermind. I found out my imac was 10.8