When the screen goes blank, wait 3 seconds and let go of the top button but keep pressing the home button.With the phone on, press and hold the top button (sleep / wake button) and home button at the same time. Open iTunes and connect your phone to the computer via USB.Make sure all of your data is backed up in iTunes. To do a DFU restore, you can do the following: See Also: How to Take a Screenshot on iPhone, iPad and iPod You can however, as the video describes above, try doing a device firmware update (DFU) restore on your iPhone or iPad to try and resolve the issue. Unfortunately, this is usually indicative of a hardware problem and the phone will need to be replaced at an Apple retail store. Receiving error 12 on an iPhone restore in iTunes is a very frustrating problem.
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