Apple Mobile Phone Help Guides and Support. — Device Firmware Update

How To Put Your iPhone 6 , 6S or 7 Model Into DFU Mode

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How To Put Your iPhone 6 , 6S or 7 Model Into DFU Mode

DFU mode, or Device Firmware Update, can be used to update the firmware on your iPhone, completely restoring the software. It’s perfect for when your iPhone fails to co-operate and is unresponsive.   You’ll want to carry out a Device Firmware Update if the standard restoration using Recovery Mode fails to work for you. A DFU is a last resort.     What Is Firmware?   Firmware is software that sits between the hardware, your iPhone, and the software, which is the iOS operating system. Firmware is used to provide a variety of functions at hardware level. It is firmware...

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