I'm selling my 3GS that's running 3.1.3 (jailbroken), and unlocked.. Also.. for the unlock, I just run ultrasn0w in Cydia, reboot, and I'm good to go? If so, then I'm all set. I can't restore back to 3.1.3 apparently since Apple stopped signing the firmware. How can I erase everything off the phone so its as good as new to the person I sell it to? Thank you!