How to enter DFU Restore Mode

Here is a guide that shows you how to enter DFU restore mode which takes the iPhone/iPod Touch back to factory state. This method is recommened when downgrading, upgrading.

1. Turn the iPhone ON
2. CONNECT it to the dock
3. Make sure iTunes is open so you’ll know when it enters DFU mode
4. HOLD the Power/Sleep-Wake button AND the Home button for around 10 secondes.
5. RELEASE only the Power/Sleep-Wake button and continue to hold the Home button
6. WAIT until iTunes recognizes the phone in DFU Restore mode (in Windows a bubble pops up saying it recognized new hardware “DFU Mode” or something to that effect)

The last step may take SOME TIME, like, say, even 60 seconds or so. The screen should be OFF (black), if you see the “Connect to iTunes” logo, START OVER. It may take a few tries to do the steps just right, just reboot (hold both Power/Sleep-Wake AND Home until the Apple logo appears and the phone turns back on) then try again.
Another Way is to hear to the sound of the hardware Disconnect and Reconnect. When you hold power and home to reset, once you hear the USB disconnect sound leave the power button but keep holding the home until you hear another USB plugin sound. This is the easiest way to know that your phone is in DFU mode.

Guide from Modmyi

Guide from Modmyi

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