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DFU mode means Device Firmware Update mode. If a restore using Recovery Mode doesn’t work, you will want to use this DFU Mode as a last
resort. When placing your iPhone into DFU Mode it will not load the iOS before attempting the restore. To put the iPhone into DFU mode, so you can do an iTunes firmware restore, follow these steps:
Open iTunes and connect the iPhone to your Mac.
Press and hold the Home button and the Sleep/Wake button at the same time.
After exactly 10 seconds release the Sleep/Wake button. Continue holding the home button until your iTunes pops up a message telling you that it has detected an iPhone in recovery mode.
The iPhone screen will remain black like this:
Note: It may take a few attempts to get your iPhone into DFU mode. Generally, I hold down both buttons then release the Home 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!