Step One Open iTunes and connect the iPhone to your Mac. Step Two Press and hold the Home button and the Sleep/Wake button at the same time.

  Step Three 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!

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