@pity206

Correction if you don't mind..I would strongly suggest you find out more info on what's DFU means via google before attempting to suggest a solution which is impropriate.

Cheers

@powx84

Here are the steps to enter DFU mode for the iPhone.

Get the iPhone into DFU mode. When in this mode, the iPhone screen is black.

1. Connect the iPhone and your Mac/PC
2. Shut down iTunes
3. Hold Power/Sleep until the red slider shows up, slide to shut the iPhone down. If this aint work hold Power/Sleep and Home until the iPhone shuts down.
3. Hold Start/Sleep and Home for 10 seconds
4. Let go of Start/Sleep but keep holding Home until...
5. ... iTunes starts up and finds an iPhone in restore/recovery mode. The iPhone screen is black.

More info on what's DFU and Recovery Mode, please read the thread below.

http://forum.lowyat.net/topic/790913 DFU and Recovery Mode [In & Out]

If all else fail, please head to this thread below for assistance.

http://forum.lowyat.net/index.php?showtopic=826183&hl

This post has been edited by davidgary73: Feb 2 2009, 08:14 PM