How to put Apple iPhone in DFU Mode
1. You should first plug your iPhone into your PC, or laptop.
2. Now turn off the device.
3. Next, press and hold the Power button for three seconds.
4. Be so kind as to employ some dexterity: press and hold both Power button and Home button for ten seconds.
5. When ten seconds pass, let go of only the Power button.
6. An iTune alert should appear. When it does, please release Home button.
7. The operation is complete. Good job!
Exiting DFU Mode
8. Now please press and hold Power button and Home button until the Apple logo appears.
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