Okay so let me explain you my situation. I have iPhone 3G fw 4.1 (previously jailbroken). I used redsnow 0.9.6b5 and in the end it won't reboot. I ran redsnow under windows xp sp 3 compatibility mode and as administrator. People have said to change USB ports while on rebooting page but it still won't work. I don't know what else to do? I am thinking about upgrading to 4.2 and trying it again but I'd rather unlock on an earlier baseband just to be on safe side.