I accidently clicked upgrade to firmware 1.0.1. (phone has been unlocked using the 'first 10 steps' (from hacktheiphone.com) and the prep for non-at&t sims.
Now while the iphone is restoring in itunes I keep getting an error message stating 'an unknown error has occured (1603).
I am really freaking out. I'm not a complete novice on computers, but I'm very much stuck at the moment. Any help would be greatly appreciated.