This tutorial explains how to downgrade iOS 5.1 or iOS 5.1.1 to iOS 5.0.1. This will work for all iOS devices including A5 devices such as, iPad 2, iPad 3 and iPhone 4S. However, there is one requirement for you to be able to downgrade your device, your SHSH blobs must have been saved.
If you have jailbroken the device at the firmware you wish to restore it to, then Cydia should have automatically saved them for you. You can also downgrade your firmware if you saved them using TinyUmbrella or another program.
If you have your SHSH blobs or think Cydia may have saved them for you, then proceed with the tutorial.
- Download the compatible version Redsn0w for your operating system.