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DFU stands for Default Firmware Update, and it’s the deepest type of restore you can do on an iPhone. 

What You Need To Know Before We Begin

The Home Button is the circular button below your iPhone’s display.
The Sleep / Wake Button is Apple’s name for the power button.
You’ll need a timer to count to 8 seconds (or you can do it in your head).
If you can, back up your iPhone to iCloud or iTunes.

Plug your device into your computer with a USB cable.
Turn off the device.
Hold the Power button for 3 seconds.
Hold the Home and Power buttons for 10 seconds.
Release the Power button but keep holding the Home button.
After about 15 seconds you will be alerted by iTunes saying that it has detected a device in Recovery Mode.

Make sure the device screen is blank and no logos are present

Exiting DFU Mode on iPhone, iPad or iPod touch

Hold the Home and Power buttons until the Apple Logo appears.

Entering DFU Mode on Apple TV

Plug the device into your computer using a microUSB cable.
Force the device to reboot by holding down the "Menu" and "Down" buttons simultaneously for 6-7 seconds.
Press "Menu" and "Play" simultaneously right after reboot, until a message pops up in iTunes, saying that it has detected an Apple TV in Recovery Mode.

Exiting DFU Mode on Apple TV

Hold down the "Menu" and "Down" buttons. The Apple TV will reboot.
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After you device is in DFU mode just press the restore button in iTunes
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