IPhone 4 iOS 5.0.1. I susessfully jail broke with Redsnow. The problem I am having is the tethered reboot. Normally I get get redsnow to recognize the phone is in DFU mode & proceed with boot. When the progress bar is almost to the end of "exploiting limera1n" the apple logo appers on the phone and red snow gets stuck. I had to reboot the device yesterday after installing "my 3G" and it took me over 40 attempts before I finally got it to boot. The one time I actually got it to boot successfully, I really can't say I did anything differently. Same thing day before yesterday trying to reboot. Finally had to restore with iTunes and re-jail break. Still took me many, many, attempts before getting a successfull reboot after jail breaking.