iHack Forums

Whether you have been experiencing battery woes, or you are just pining for an untethered jailbreak, there are a variety of reason as to why you may wish to downgrade your device from iOS 5.1 back to iOS 5.0.1

So long as you’ve saved the SHSH blobs of the firmware you wish to downgrade to (Cydia’s homepage will notify you), then you can quickly remove yourself from what is fast becoming a fiasco of an iOS 5 release.

Important Note: Before you begin, keep in mind that the iPhone 4S cannot be downgraded to an earlier version of iOS, unless Apple is signing that particular firmware version to which you’re downgrading to. Only the iPhone 4, 3GS, iPad 1 and the iPod touch users can downgrade back to both iOS 5.0.1 (custom firmware only)   You cannot save SHSH blobs once Apple has stopped signing the firmware you want to downgrade to.

All set? Let’s begin:

For downgrading to iOS 5.0.1/5.0 custom firmware using iFaith

As mentioned above, if you have both APTicket+SHSH blobs saved for iOS 5.0.1 or 5.0, you can downgrade your device to a custom iOS firmware. This however wont work on iPhone 4S and iPad 2. Only iPhone 4, 3GS, iPad 1, and iPod touch users can downgrade to iOS 5.x custom firmware using this method.

Step 1: Simply download the latest version of iFaith for Windows from here, official stock iOS 5.0.1 firmware from here.

Step 2: Build a signed firmware file by clicking on ‘Build *signed* IPSW w/Blobs’.

Step 3: Browse for the SHSH blobs file that you previously saved for your current device to downgrade back to the old 5.0.1/5.0 firmware. Next, iFaith will ask you to select the stock firmware of which you want it to create custom firmware file from. Once done, iFaith will have a new custom firmware file for you waiting on the desktop with SHSH blobs incorporated for the firmware you are downgrading to.

Step 4: Next, enter DFU mode using iFaith and then simply use iTunes to restore to this custom firmware file.

That’s it! you are done.