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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