Ok , I have done the greenpoison jailbreaking and everything is fine until the end and it freezes on the reboot. it has the picture of the itunes with the usb picture on the phone and does nothing. I have tried this several times and keep ending up with the same result. I have tried greenp, snow and etc. nothing is working. i have to restore it back every time. any suggestion or fixes for this issue. it looks like it working until the boot up . it just will not boot.