How to downgrade iOS 5.1 to 5.0.1 without SHSH iPhone, iPod touch or iPad?
Downgrade 5.1 to 5.0.1 – iPhone 4, 3GS, iPod Touch 4G, 3G, iPad 2, 1 :
Required Downloads :
Download Host file
Download Sn0wbreeze for Windows
Download TinyUmbrella - Windows / Mac
Download Redsn0w 0.9.10b6b for Windows / Mac
Download iOS 5.0.1 for your iOS device
Download iTunes Windows / Mac
How to Downgrade 5.1 to 5.0.1 without SHSH blobs files Tutorial :
Step 1: You have to go to C:\Windows\System32\drivers\etc , and replace “HOST” file downloaded above.
Step 2: Open redsn0w and jailbreak your device, you can follow this tutorial - Click Here - but you have to point to iOS 5.0.1
Step 3: Then the iPhone will stop on the recovery mode.
Step 4: Open Tinyumbrella (can be found in “Restore Files” folder above), then click on your iPhone name at the left then press on Start TSS Server.
Step 5: Open iTunes and restore your iPhone with iOS 5.0.1 firmware (Shift + Restore) then close it.
Step 6: You will find error 1013, at this time you have to use Fixrecovery (can be found in “Restore Files” folder above).
Step 7: Open iFaith (downloaded above) and Save shsh file.
Step 8: Open sn0wbreeze (downloaded above) to create custom iOS 5.0.1 firmware and restore with it. Done.
If you get 3194, 1600, 1602, 1013, 1015, 20 errors, you can fix it: