downgrading 4.0.1

[teekboi1229]

hi newbie here, is there a thread/guides on how to downgrade ur iOS 4.0.1 to iOS 3.1.3. stupid me accidentally updated my iPhone 3GS thus erasing all my jailbreak.. pleading for help, thanks

 

[big9erfan]

Try this : Caching Apple's Signature Server - Jay Freeman (saurik)