So I have a 3GS here thats currently jb and unlocked. Its running 4.0.1 with baseband 5.13.04. I was hoping to upgrade it to the latest 4.2.1 and then use ultrasn0w. Also currently i have my hashes saved for iOS 4.0, 4.0.1, 4.0.2, 4.1, 4.2.1+ How can I exactly go about upgrading and then re-unlocking it? Unlock is a must as i am with Rogers and its a AT&T branded phone.