My dad wants to update his iPhone OS to the latest one. He's currently at iPhone OS 1. something. His phone is jailbroken and unlocked, so he's not sure how to update it. Usually, he takes it to a shop to have it updated, but I was able to unlock his new iPhone 3GS so he trusts that I can have it done without any issues. I believe that if I restored his iPhone through iTunes, update to 3.1.2 and then run Blackra1n... it will work. Will it work? If not, is there an easy way to do it?