Sometimes, in order to restore your iPhone firmware using iTunes, you need to put iPhone into Recovery Mode. But if recovery mode doesn’t work for you and you could not restore you iPhone, then you need to Put your iPhone in DFU Mode. Lets learn how to enter iPhone in DFU Mode in order to restore its firmware.
What is DFU Mode
DFU stands for Device Firmware Update. Unlike Recovery Mode, DFU Mode doesn’t load the firmware/OS currently installed before restore attempt. DFU mode will be considered as a last resort to restore if a restore using Recovery Mode doesn’t work and you are getting error while restoring you device.
How to Put iPhone in DFU Mode
Open iTunes and connect the iPhone via USB.
It may take a few attempts to get your iPhone into DFU mode. Generally, I hold down both buttons then release the Wake/Sleep button just before I think the Apple logo would appear. If you are still holding both buttons down and you see the Apple logo you are holding them down for too long!