When he came iOS 5.1 the vast majority of users rushed to download it just think of the advantages and disadvantages that this could be. one of the most important is the loss of untethered Jailbreak. There is currently tethered jailbreak for all devices except those carrying iOS A5 processor (iPad iPhone 2 and 4S).
For those who want to return to the previous version of iOS and still enjoy the benefits of untethered jailbreak with this solution .
IMPORTANT : valid for all devices A4 and only iPad 2 (in IOS 4.x) of the A5, the iPhone 4S not supported.
5.0.1 IOS Restoration with iFaith
The first is to download the program iFaith , the 5.0.1 version of the device that we will restore and iTunes 6.10 .
Run the program and select “Build signed IPSW w / Blobs “>” Build IPSW “
Select the files you have saved SHSH of our device (without them we can not make the process), then add the ipsw when we requested and the program will create a version of IOS on your desktop.
Finally you simply open iTunes, put the device into DFU mode and restore with the firmware that we had previously created.