Discuss [HOW TO] Downgrade Iphone 3Gs from 3.1.3 to 3.1.2 (with SHSH) at the Genius Bar - HowTos, Guides and Tutorials - Hackint0sh.org; First off all Credit goes to Saurik & Reako.
Very important -
You must have ...
[HOW TO] Downgrade Iphone 3Gs from 3.1.3 to 3.1.2 (with SHSH)
First off all Credit goes to Saurik & Reako.
Very important -
You must have your SHSH on file with saurik and have already edited your hosts file prior to this document. A simply google search will teach you how to edit the hosts file on Mac and Windows.
Bypassing the Overlord
To this end, I have constructed a server that duplicates the functionality exposed by Apple's signature server, except using "on file" results rather than live requests.
All we need, then, is to make iTunes use it. Luckily, most operating systems also have the ability to locally define bypasses on specific hostnames through a file called hosts. Using this, we can redirect requests to Apple's signature server to Cydia.
So, open the file C:\Windows\System32\drivers\etc\hosts (Windows) or /etc/hosts (Mac OS X) and add the following entry to the bottom of the file.
-First, connect your iPhone to the USB and put it into DFU mode. (if you don't know how to get into DFU mode, please google it). iTunes will display an alert stating you need to restore your device, click ok then hold option + click restore and navigate to your previously downloaded 3.1.2 FW.
- After the restore finishes you should be hit with a 1015 error. That's expected. Your phone should be in Recovery mode now and iTunes will tell you to restore again. Click ok then hold option + click on restore again - this time you do not have to go into DFU mode - and navigate to the 3.1.2 FW.
-After the restore finishes again it'll throw another 1015 error. That's expected again. This time, just select ok and close iTunes. Fire up redsn0w - make sure it's the 0.9.4 version - and jailbreak as normal.
-After the jailbreak is finalized your device should reboot and strange enough you successfuly downgraded to 3.1.2.
PLEASE NOTE: AFTER THE FIRST JAILBREAK YOUR DEVICE WILL NOT BE JAILBROKEN. Don't ask my why but for some reason all it does is properly finish the downgrade process.
Now, you are more than welcome to use your favorite jailbreak software (blackra1n or redsn0w) to re-run jailbreak process and once it's finished VOILA! You should be jailbroken on 3.1.2 WITH service!
Last edited by Woore; 02-07-2010 at 07:58 AM.
How to downdrade iPhone 3gs 3.1.3 to 3.1.2
I would like to know how to downgrade my iPhone 3gs
Your work is absolutely stunning. I upgraded my unlocked iPhone 3G firmware from 3.1.2 to 3.1.3. I just bought it day before yesterday and couldn't sleep for more than 24 hours, downloaded more than 6GB of software, recovery files, but no solution. Finally I could downgrade to 3.1.2 and could access the phone features. I will try jailbreaks and unlocking options now.
Originally Posted by Woore
God bless you my friend.
Just to be clear:
This guide is a lot more detailed.
Hack that Phone - iPhone 3G S: Restoring "forbidden" firmware
Also, nice to credit Saurik and quote from his article but even better if you linked to it as well: Caching Apple's Signature Server - Jay Freeman (saurik)
Finally - this will not downgrade baseband - so anyone who relies on an unofficial unlock (blacksn0w, ultrasn0w etc) is out of luck until an updated unlock is released (that will occur after iOS 4.0 is released.)
Please read the stickies & search forum before posting! How to report an iTunes restore/update fail in a useful manner
iPad 3G 64GB (4.3.3, Redsn0w) oldest SHSH 3.2.2
iPhone 4 32GB (4.2.1, Redsn0w JB-monte) oldest SHSH 4.1
iPhone 3GS 32GB (4.3.3; Pwnagetool) factory unlocked oldest SHSH 3.1
iPhone 8GB (3.1.3; Pwnagetool) AT&T Locked - Unlocked with bootneuter
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O wow thanks that worked great actually not that I was doubting you. Thanks man.
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