I have tried restoring to factory settings with Windows XP and Itunes 9. It goes through all the processes and puts my phone in DFU mode (USB cable to Itunes Icon) Then after a while it gives me an "Unknown error 1604" (I think it said 04) and stays in DFU mode. (Had to get IREB to get it out of loop) Anyways I know there is an alternate way to do this on the phone itself. Is this what I need to do or does anyone have any suggestions? I jailbroke my 3gs with redsnow on 3.0.1 firmware, and I also have the MMS update. Have also tried different computer and USB cable. Same results.