I tried to unlock my 4gig with geounlock and it froze. I reboot then restore with itunes, but it just gave me error 1 on 1.1.1 and 1.1.2. I checked the version and it was blanked out.

This is how I did to upgrade my 4gig from 3.9 to 4.6.

Leave the phone on

Connect cable to USB wait......until you hear it connects.

Hold home and sleep until it disconnects then let go of the sleep, but hold home until you hear it reconnects.

Your screen should be black... Nothing on it. If you have a logo on the screen then read again and redo it.

Run itunes and restore it.

Done... It worked for me...