sorry i need help can anyone tell me why i helped my friend to jailbreak the iPhone 3GS on iOS 4.1 and i used limera1n and greenposi0n to jailbreak but both fail both had the same problem as both show its in DFU mode but please wait then it hang there for hours and green posi0n is keep asking me to try again after i follow the instruct on the screen for hold the home and power button together