Devon777 3 Report post Posted December 19, 2013 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/ipad/ipod into DFU Mode it does not load the OS before attempting the restore To put the iPhone into DFU mode so you can do an iTunes firmware restore follow these steps:Step OneOpen iTunes and connect the iPhone to your PC and turn device OFF! Step TwoPress and hold the Home button and the Sleep/Wake button at the same time for 10 seconds Step ThreeAfter 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/iPad/iPod screen should remain black like this if not then Repeat steps NOTE***: It may take a few attempts to get your iPhone into DFU mode. If you are still holding both buttons down and you see the Apple logo you have held them down for too long! Repeat 1 Share this post Link to post Share on other sites