I'm on 3.0.1, I'll be creating a custom ipsw w/ my friends Mac. Know is the custom ipsw a tethered J/B were I have to always be by a computer to download from the phone and respring? If so I may not waste my time. BUt if not let me know. I'm going to 3.1.2 I have a 3gs since the first month it came out if that makes a difference..