I have a jailbroken Ipod Touch 2g with 3.1.2, I'd like to get 4.0. I haven't been keeping up with the latest JB news and have no idea where to start.I also want to start fresh, meaning i want my ipod to have nothing on it at all, as if it had just arrived from the factory. Could I just do an official update to 4.0 and then jailbrake it? Which JB tool should I use? How do I make sure it will be fresh? Thanks for any help. P.S I have tried searching but haven't found any clear advice on my particular inquiry.