Hi there, I've looked around but I am unsure about the basband preservation for an upgrade. I have an iPhone 3GS on 3.0.11 and it is unlocked through ultrasn0w. I want to upgrade to the latest jailbroken ios but not sure how to go about it. Do I have to preserve the baseband or can I just update to 4.3.1 and use jailbreakme? Thanks for the help.