How can I upgrade my jailbroken and unlocked iPhone 3GS to 4.2? I have an iPhone 3GS running on 4.0.1 and I want to upgrade it to 4.2 with my Mac. How can I go about doing this?


Current Version: 4.0.1 (8A306)
Model: MB7... 
Modem Firmware: 05.13.04
There is nothing special to upgrading when jailbroken or not. You must use the official upgrade path which means losing unlock and jailbreak, and then re-jailbreak and re-unlock if you want and if it is possible with the new firmware. So...


Plug it in
Follow the prompts in iTunes