I have read all the insturctions -downloaded the latest redsn0w and iphone 3.0 ispw file. The redsn0w finds the file but when I follow the instructions to put the phone in DFU mode it just shuts off and never comes back on. The program recgnizes the phone and starts to load the programing but just stops after a few screens and states "waiting to reboot." I have to unplug the phone and reboot to get it to start?? Any thoughts - suggestions??