DFU - means Device Firmware Update. If a restore using Recovery Mode doesn't work you will want to use DFU Mode as a last resort. When placing your iPhone into DFU Mode it does not load the OS before attempting the restore
DFU
-Run iTunes and connect (plug in) your iDevice
-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 you iTunes pops up a message telling you that it has detected an iPhone in recovery mode.
-The iPhone screen will remain black like this:
Recovery
-Open iTunes and connect the iPhone to your Mac.
-Press and hold the Home button and the Sleep/Wake button at the same time.
-As soon as the screen goes black release the Sleep/Wake button. Continue holding the home button until you iTunes pops up a message telling you that it has detected an iPhone in recovery mode.
-The iPhone will look like this:
DFU
-Run iTunes and connect (plug in) your iDevice
-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 you iTunes pops up a message telling you that it has detected an iPhone in recovery mode.
-The iPhone screen will remain black like this:
Recovery
-Open iTunes and connect the iPhone to your Mac.
-Press and hold the Home button and the Sleep/Wake button at the same time.
-As soon as the screen goes black release the Sleep/Wake button. Continue holding the home button until you iTunes pops up a message telling you that it has detected an iPhone in recovery mode.
-The iPhone will look like this:
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