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How to put your ios device into dfu mode
Press and hold the sleep/wake button on your ios device until the slider appears.
The sleep/wake button is on the side of the phone (iphone 6 and later) or on the top of your phone. ( all other iphones, ipods and ipads )
Drag the slider to turn the device off.
After the device is turned off, hold the power button for 3 seconds. Without releasing the power button, press and hold the home button.