DFU (Device Firmware Upgrade). At the time the iPhone is in DFU mode, you can upgrade or downgrade your iPhone OS. The characteristics when the iPhone has entered into DFU mode is the screen was off, but when connected to iTunes on a computer can still connect, get a warning on iTunes that the iPhone is in DFU mode. When DFU mode means the iPhone is ready to upgrade or downgrade its OS.
How to make the iPhone into DFU mode
are as follows:
1. Press the sleep button and hold the home button simultaneously for 10 seconds.
2. At the tenth second, release the sleep button and keep hold the home button for 15 seconds.
3. iPhone into DFU mode.
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