DFU is Device Firmware Update. You should put your iPhone into DFU mode If a restore using Recovery Mode doesn't work. When placing your iPhone into DFU Mode it does not load the OS before attempting the restore
Steps:
Step 1: Connect your iPhone to your Mac/PC and press power button for few seconds. You will be asked to slide to power off. Slick it to power off your iphone.
Step 2: Now Press and hold Home button and the Sleep/Wake button at the same time.
Step 4: Once you are in DFU mode you wount see anything on you scree. It will be BLACK.
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