The “Revirginizer”, a new release from the iPhone Elite Team, will return your unlocked iPhone to its original 1.0.2 state. Therefore allowing the safe upgrade to the 1.1.1 firmware.
Hopefully this means an end to the phone bricking that has plagued the few who ignored all advice and attempted to upgrade an unlocked iPhone.
This process is designed to rebuild your lock table in the seczone area and repair the damage done by the original anySIM unlock. In essence, it re-virginizes your phone.
The software can be found on the team’s Google Code page.