Up until now, it was impossible to downgrade iOS 5 device firmware since Apple has started signing SHSH blobs differently in iOS 5 than it did in previous versions, disabling users from replaying them during a firmware restore, It has become impossible to downgrade in iOS 5.
Again, iFaith is a Windows only tool meaning you`ll need a Windows box to successfully back up your SHSH blobs for iOS 5 and create singed IPSW which can use whether Apple is still signing that particular firmware or not.
How to Save Your iOS 5 SHSH Blobs.
Step 1: Download and run iFaith.
Step 2: Put Your device into DFU Mode.
Step 3: Select "Dump SHSH Blobs" click Proceed, Let’s Go!, select No on the Apple TV 2 prompt, and click Start.
Step 4: iFaith will dump your SHSH Blobs and ask you to save them. Save them on your desktop.
How to Create a Custom Signed IPSW for Future Downgrading.
Step 1: Run iFaith.
Step 2: Put Your device into DFU Mode.
Step 3: Select "Dump SHSH Blobs" click Proceed, Let’s Go!, select No on the Apple TV 2 prompt, and click Start.
Step 4: Browse for your device’s current firmware. You can also download directly from iFaith, but I recommend using the browse feature.
Step 5: Click Build IPSW.
Step 6: It will Extract the IPSW and place it on your desktop.
Step 7: Click Proceed and Click Start (Your device should already be in DFU mode, this will place it into PwnedDFU mode for custom restore using iTunes).
Step 8: Close iFaith, open iTunes and it should find your device in recovery mode. Hold Shift and click Restore and find your custom firmware. The firmware should be named something like: 0000000000_iFaith_iPhone_4-5.0.1 (9A405)_signed.ipsw.
What we showed here is a custom iOS 5.0.1 which means the downgrade can’t be verified until iOS 5.1 is released and Apple stops signing 5.0.1.
Again guys, this will not work on iPhone 4S or iPad 2.
[Via]
Step 1: Download and run iFaith.
Step 2: Put Your device into DFU Mode.
Step 3: Select "Dump SHSH Blobs" click Proceed, Let’s Go!, select No on the Apple TV 2 prompt, and click Start.
Step 4: iFaith will dump your SHSH Blobs and ask you to save them. Save them on your desktop.
How to Create a Custom Signed IPSW for Future Downgrading.
Step 1: Run iFaith.
Step 2: Put Your device into DFU Mode.
Step 3: Select "Dump SHSH Blobs" click Proceed, Let’s Go!, select No on the Apple TV 2 prompt, and click Start.
Step 4: Browse for your device’s current firmware. You can also download directly from iFaith, but I recommend using the browse feature.
Step 5: Click Build IPSW.
Step 6: It will Extract the IPSW and place it on your desktop.
Step 7: Click Proceed and Click Start (Your device should already be in DFU mode, this will place it into PwnedDFU mode for custom restore using iTunes).
Step 8: Close iFaith, open iTunes and it should find your device in recovery mode. Hold Shift and click Restore and find your custom firmware. The firmware should be named something like: 0000000000_iFaith_iPhone_4-5.0.1 (9A405)_signed.ipsw.
What we showed here is a custom iOS 5.0.1 which means the downgrade can’t be verified until iOS 5.1 is released and Apple stops signing 5.0.1.
Again guys, this will not work on iPhone 4S or iPad 2.
[Via]
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