I have a 3G on 3.1.3, jailbroken using jailbreakme, working fine without any issues. As I understand, 4.0.1 is the last version that is still able to be jailbroken untethered, right? If so, how can I upgrade to that version? It's not an option on itunes, because it's showing me to upgrade to 4.2 I think. If it is possible, and I do upgrade to 4.0.1, will I lose all of my original apps and all apps downloaded using cydia and installous? Is there a way to backup everything that I have now, and then re-install it after the change to 4.0.1? If it is possible, what would be the EASIEST way to upgrade?