How to put Apple iPhone 4s in DFU Mode
1. Turn off the device.
2. Please plug your device into a PC or laptop.
3. Be so kind as to employ some dexterity: press and hold both Power button and Home button for ten seconds.
4. When ten seconds pass, let go of only the Power button. Hold the Home button for another ten seconds.
5. iTunes should now detect your device in Recovery Mode.
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