My jailbroken/unlocked iPhone 3GS was recentlly resetting all settings but it froze at the progress bar. It has iPad baseband 6.15.00 . So now it's in DFU mode and iTunes tried restoring it but I'm getting error 1600 . Any help? I have no SHSH for the iPhone and I have a 5.1.1 restore .ipsw but redsn0w doesn't accept it. Thanks!!!