Moving from 4.0 (Beta 1) to 3.1.3?

Others (the hackers) have stated you cannot downgrade from 4.0 back to 3.1.3.

 

You need to restore the device again the same way after you got the 1015 error, if you get it again, you're good. Now, you need to install some things, I only have the Mac version available, sorry if you use Windows. Go to http://www.applehack23.com/AppleHack23/Downloads.html, and find iRecovery, and libusb, (libusb for your operating system). Once those are installed go to http://www.applehack23.com/AppleHack23/iRecovery_Commands.html

Hope this helps!

*EDIT

Oh I'm sorry, iClarified said to Jailbreak with redSn0w after the second 1015 error. But I guess its running the same commands.

 

That would suck if it really is true. I hope the Dev-Team finds out a way around it.

 

What really Sucks is why all these fools rush to put 4.0 beta on their phone.
Doesn't run unless you have a developers account and it's a beta.
Some never learn.

 

There shouldn't be a problem downgrading as long as I've got my SHSH files backed up, right?

 

That's not the issue here. That only comes into play with firmware signing.

 

I have read the phone goes into a DFU loop if you try to downgrade.

 

Hey hows it going

Unfortunately I did the same thing and upgraded to 4.0 beta, not knowing that i would be stuck with the message "Your iPhone is not registered with the Dev program" and my iPhone would be useless because I didn't sign up my iPhone for the Dev Program.

(Your case may be slightly different if you were registered but downgrading should work all the same)

Anyways after fiddling round I found that I could downgrade by doing this

1. Put your iPhone into recovery mode by

-Plugging your iPhone into your computer/iTunes
-Holding the Home and Sleep button for exactly 10 seconds
-Then release the Sleep button but keep holding the Home button (the round one)
-Keep holding the Home until iTunes finds an iPhone in recovery mode.

2. Restore to the firmware you wish by pressing the restore button

-I myself restored the firmware to 3.1.2

3. You will receive the error 1015.

-Do not click out of the error message
-Use the appropriate jailbreak for the firmware you have downgraded to (I used blackra1n)
-This returns my iPhone to 3.1.2 (Jailbroken)

4. Restore iPhone to 3.1.3 or 3.1.2 to remove the Jailbreak

Hope this works

 

when you restore on old firmware how apple let you downgrade via itunes?> does not check ur ECUID id or something?

 

And again the young and foolish rush to upgrade, having failed to learn after updating to 3.1.3...

like lemmings swarming over a cliff !

 

Do you have an english tutorial a friend has done this to his 3G and wants to get it back.

 

Ok this is probably a stupid question but, can a developer with iPhone at 3.1.3 upgrade to 4.0 beta and then downgrade to 3.1.2?

 

Thanks mate.. This worked.

 

Actually no its not a stupid question. I was wondering this myself, because I think it would be good so developers can test their apps on older firmwares, so it works for people who haven't updated yet, or who don't have a computer.

 

I wrote a tutorial on how to downgrade (in english ) Hopefully that will help most of the people who have run into that wall. As far as I know, iTunes will not let you downgrade, developer or not. If someone would like to try my tutorial I would love to get some feedback on it.

 

Here was the process I used to revert to 3.1.3 on an early bootrom 3GS with my SHSH files previously backed up to Cydia.

1. Enter recovery mode and restore to 3.1.2.
2. On finish encounter something like error 1015. Use iRecovery to exit recovery mode.
3. Jailbreak using Blackra1n.
4. Use PwnageTool to create a custom 3.1.3 firmware.
5. Enter recovery mode and restore using said custom 3.1.3 firmware.

And done. The custom 3.1.3 firmware restore kept failing if I wasn't already jailbroken. iTunes would always freeze on "preparing iPhone for restore" if I skipped the 3.1.2 and Blackra1n steps.

 

Did you try the post right above yours?

 

No, I never used DFU mode. Doing that got me 1600-type errors.