I used to be up to date with this stuff all the time but took a 3 month break so I have no clue what's going on... I have purplera1n 3.0 jailbreak on my 3GS, and I remember something about 2 files which I had to extract from my phone if I ever wanted to jailbreak again. I want to get the newest 3.1 update jailbreak with my 3GS. Isn't there also an app from cydia which I have to use to back my jailbreak up (cybackup?)?