Bricked my MacBook Air?

Emepro

macrumors newbie
Original poster
Jun 23, 2019
11
0
So I tried to downgrade from Catalina to Mojave, I have a USB drive with Mojave on it but then I think I ****ed up and may have erased the wrong thing because now the only thing I can do is internet recovery but it fails and says "apple.com/support -9000F". If anyone knows what to do so I can use my MacBook again it would be really appreciated
 

Emepro

macrumors newbie
Original poster
Jun 23, 2019
11
0
Did you erase the Macintosh HD (or whatever yours is named) drive and nothing else?
Honestly I'm not sure what I erased but I went in the disk utility and there was 3 things, one I couldn't erase and 2 APFS volumes and I deleted those 2
 

pippox0

macrumors member
Jan 23, 2014
73
53
Don't worry
You need to create a mojave usb installer on another computer

Then boot MBA with this Usb installer, with disk utility erase hdisk/ssd and install a fresh copy of Mojave.
 
  • Like
Reactions: tamaralig

Emepro

macrumors newbie
Original poster
Jun 23, 2019
11
0
Don't worry
You need to create a mojave usb installer on another computer

Then boot MBA with this Usb installer, with disk utility erase hdisk/ssd and install a fresh copy of Mojave.
But how do I do that I can't get access to anything except internet recovery. I just turn the MacBook with the USB plugged in?
 

mikecwest

macrumors 6502a
Jul 7, 2013
978
326
But how do I do that I can't get access to anything except internet recovery. I just turn the MacBook with the USB plugged in?
As he said, from another computer. You need to do it from a computer running Mojave...once you make the USB bootable drive, you start your mac from that.
 

Emepro

macrumors newbie
Original poster
Jun 23, 2019
11
0
As he said, from another computer. You need to do it from a computer running Mojave...once you make the USB bootable drive, you start your mac from that.
Yeah so I already have the bootable drive but when I turn the MacBook on while holding OPTION, the computer freezes like 30 seconds later. Were you talking about starting my Mac from the bootable drive after holding OPTION or is there another way?
 

pippox0

macrumors member
Jan 23, 2014
73
53
First of all
Reset smc and pram

Then boot from external bootable drive, holding option key.

It should take only some seconds.
When you have login on system, you can see what you have done on internal ssd.

Then clone or install mojave..

Tell us if you resolve the issue.
 

Emepro

macrumors newbie
Original poster
Jun 23, 2019
11
0
First of all
Reset smc and pram

Then boot from external bootable drive, holding option key.

It should take only some seconds.
When you have login on system, you can see what you have done on internal ssd.

Then clone or install mojave..

Tell us if you resolve the issue.
Yes but it freezes after less than a minute. So I can't use the bootable drive
 

lolasher

macrumors newbie
Aug 1, 2014
28
5
Try booting without usb plugged while holding option key to see if computer stops freezing. Are you sure you didn't accidentally erased usb volume while trying to delete system volumes? And I think installation failed because to downgrade from Catalina you need to erase entire disk, deleting volumes doesn't work because something was changed to make standalone system volume (I tried downgrading same way, didn't work, erasing entire disk and installing on new partition table was successful).
 

Emepro

macrumors newbie
Original poster
Jun 23, 2019
11
0
First of all
Reset smc and pram

Then boot from external bootable drive, holding option key.

It should take only some seconds.
When you have login on system, you can see what you have done on internal ssd.

Then clone or install mojave..

Tell us if you resolve the issue.
Yes but it freezes after less than a minute.
Try booting without usb plugged while holding option key to see if computer stops freezing. Are you sure you didn't accidentally erased usb volume while trying to delete system volumes? And I think installation failed because to downgrade from Catalina you need to erase entire disk, deleting volumes doesn't work because something was changed to make standalone system volume (I tried downgrading same way, didn't work, erasing entire disk and installing on new partition table was successful).
Well with and without the USB plugged in it eventually freezes. And yes I may have erased USB volume but now I don't have access to disk Utility anymore
[doublepost=1561338675][/doublepost]
Have you tried booting into an installer USB?
Yes it freezes for some reason before even being able to choose anything
 

Emepro

macrumors newbie
Original poster
Jun 23, 2019
11
0
It freezes before being able to choose what? A drive to boot from? Or the options in the actual boot drive?
I don't even have time to connect to the network it freezes before the end and if I'm fast enough, it freezes when it's done
 

Emepro

macrumors newbie
Original poster
Jun 23, 2019
11
0
Why are you always trying to use internet recovery? Try re-doing your installation drive and seeing if that'll work.
No matter what I do it always ask me to connect to a network
[doublepost=1561346663][/doublepost]
What model of MacBook Air do you have? Depending on the model, there are many ways of launching Recovery HD, and each one of them do something slightly different.
You should try Shift-Option-⌘-R
MacBook Air 2018 (2019 refresh) and I already tried it, it ask me to connect to a network, loads for 10 minutes then tell me "Apple.com/support -9000F"
 

Emepro

macrumors newbie
Original poster
Jun 23, 2019
11
0
https://discussions.apple.com/thread/250425419

See here Apple forum

You got the error because, at the moment, no internet recovery server is created by Apple for Catalina beta

So your options are:
1.Create an usb installer with Mojave on someone else computer
Or
2.go for Apple help at Genius bar
I already tried 1. and it won't let me but I have an other computer so I guess I could wait for September and the final release of Catalina so there's servers
 

oatman13

macrumors regular
Feb 14, 2013
208
57
I already tried 1. and it won't let me but I have an other computer so I guess I could wait for September and the final release of Catalina so there's servers
I'm sorry that you are being given bad advice.
You have a T2 based Mac; which means unless you have already booted to Recovery and turned on "Allow External Boot" you will be unable to use `createinstallmedia` to reinstall the OS. Since Internet Recovery is not recognizing your device, it is literally a brick; there is nothing you can do. (YAY T2 chip..)

You need to book an appointment with the Genius Bar. I'm really sorry.
 
  • Like
Reactions: adrianlondon

pippox0

macrumors member
Jan 23, 2014
73
53
T2 chip on emergency is very bad.

BTW
Did you just tried these keys ?

Command (⌘)-R

Install the latest macOS that was installed on your Mac. (i.e. Catilina )

Option-⌘-R

Upgrade to the latest macOS compatible with your Mac. (i.e. Mojave)

Shift-Option-⌘-R

Install the macOS that came with your Mac, or the closest version still available. (i.e. High Sierra / Mojave )
 
Last edited:

Emepro

macrumors newbie
Original poster
Jun 23, 2019
11
0
I'm sorry that you are being given bad advice.
You have a T2 based Mac; which means unless you have already booted to Recovery and turned on "Allow External Boot" you will be unable to use `createinstallmedia` to reinstall the OS. Since Internet Recovery is not recognizing your device, it is literally a brick; there is nothing you can do. (YAY T2 chip..)

You need to book an appointment with the Genius Bar. I'm really sorry.
Alright then thanks. But are you sure internet recovery doesn't work only because there's no servers for Catalina yet as I saw a couple of times?
 

oatman13

macrumors regular
Feb 14, 2013
208
57
Alright then thanks. But are you sure internet recovery doesn't work only because there's no servers for Catalina yet as I saw a couple of times?
Try CMD+OPT+R; and if that doesn't work try CMD+OPT+SHIFT+R.

If both of those produce no luck, then your next stop needs to be an Apple Store.