Reverting back to Iphone 3.1.3?

jgallcash

I have a 16GB iPhone 3GS & I recently upgraded to OS 4.0. Since upgrading I have had lots of issues (my phone refuses to back up)

The phone isn't and has never been jailbroken. I'm using the iphone with Windows 7.

Is there anyway I can revert my phone software back to OS 3.1.3? I dont want to void my warranty by jailbraking the phone.

Scrilla

Try the following article. Read thoroughly!

http://m.lifehacker.com/5572003/how-to-downgrade-from-ios-4-to-iphone-313?skyline=true&s=i

(Sorry for mobile link.)

jgallcash

"Update: If you're on 3GS and having trouble with this method, reader Richard notes that for 3GS users: "Apple started signing their restore files requiring iTunes to "Phone home" and get permission to restore. Usually within 24 hours of a new firmware release, Apple stops signing the old versions preventing you from restoring back to an older version. The advice in your article about how to downgrade to 3.1.3 no longer works [for 3GS] because a few days ago Apple stopped signing that firmware."

marleyboy

Downgrade iPhone Firmware 4.0 Beta To Firmware 3.1.3


Steps Edit HOSTS File In Windows And Mac

For Windows Users:

1. Navigate to Start->All Programs->Accessories and then right click on the Notepad icon and choose Run as Administrator
2. Now go to File menu in opened Notepad and choose Open or simply press Ctrl+O. Browse to C:\Windows\System32\drivers\etc and open HOSTS file.
3. Once HOSTS file is opened, copy-paste the following line at the end of file as shown in the screenshot below
4. Now again go to File menu and choose Save or press Ctrl+S.For Windows:

For Mac Users:

1. Click Go->Go to Folder and then enter path /etc
2. Now open HOSTS file with TextEdit and add the following line with at the end of the file as shown in the screenshot below.
3. Now go to File and choose Save As, uncheck If no extension is provide, use .txt and save the HOSTS file on your desktop.
4. Now replace the original HOSTS file with the one you just saved on your desktop. Incase you are prompted for the password, just enter it and click OK.

Steps To Downgrade iPhone OS 4.0 To iPhone OS 3.1.3

1. Disconnect any cable or dock attached to your device and turn it completely off.
2. Now hold down the home button and while holding it, connect your device to your PC / Mac via cable or dock.
3. Don't release home button unless you see a dock cable pointing to the iTunes icon.
4. Now you are in recovery mode. Now launch iTunes if you haven't already.
5. iTunes will detect your iPhone in recovery mode as shown in the screenshot below.
6. Windows users: Press Shift+Restore button to select iPhone OS 3.1.3 IPSW file.
7. Mac users: Press Option+Restore button to select iPhone OS 3.1.3 IPSW file.

Update: Downgrade iPhone Firmware 4.0 Beta To Firmware 3.1.2
Incase your encounter error messages with code 1011, 1013 or 1015, simply ignore these but if you encounter error messages with code 1601, 1602 or 1600, then try putting your iPhone in DFU mode again. You can look for a fix here.

jenny_d_3

WOW! Thanks for that detailed explanation!! I wanted to revert back to 3.1.3 on my 3G too. On my 3GS it works just fine by the way.

vix2000

jgallcash wrote: »

Is there anyway I can revert my phone software back to OS 3.1.3? I dont want to void my warranty by jailbraking the phone.

My 3gs was jailbroken as soon as I got it. Apple replaced it under warranty after a problem with the screen a coupe of months ago. I just restored to factory settings. Why would a jailbreak void the warranty?

jgallcash

Thanks Marley.


VIX

HERE you go.

vix2000

That thread is basically saying that it doesn't void your warranty as long as you do a DFU restore, as I previously said?????

robbies_gal

thanks for the fix marleyboy

ive been having probs with my 3gs ever since i upgraded it keeps freezing on me at least once a day andi have to reboot

its doing my head in now

will try than and will come back let you know if it works

gazzer82

As an aside, have you updated to the latest version of iTunes?

Backing up is broken on anything earlier than 9.2 on iOS4.

Also if you are finding you iPhone is misbehaving after an update to iOS4 it may be worth trying to do a clean restore to 4.0.1 and do "Setup Phone as New" rather than "Restore from Backup" as you have have something lurking in the backups thats causing the issue. You will however loose everything on your phone this way, so if you don't have them synced somewhere else such as gmail/yahoo/mobileme!!!

Cheers

Gareth

robbies_gal

hi gareth yeah i have 9.2 i might try a clean restore i suppose i just dont want to wipte it all just for it to be the same again

it sonly since i upgraded to 4 that it started though