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The following procedure is a special firmware recovery mode (DFU). It will re-install the operating system on the device and then re-sync user data once it is done.
Make sure you have downloaded and installed the latest version of iTunes before attempting this:http://www.apple.com/itunes/download/
* Open iTunes
* Connect the iOS device to the computer
* Turn off the iOS device (hold down the sleep/wake button on the top) until you see the red slider and slide the red slider across to the right OR
until the device simply shuts off, if locked up.
* Hold down the sleep/wake button AND the home button (on the front)
for 10 seconds
* Release the sleep/wake button but CONTINUE to hold the home button
* iTunes should pop up and tell you it’s found a device in recovery mode, click ok and continue along for the restore
If it doesn’t work the 1st time, start from the beginning and try again. If iTunes *still* doesn't recognize the device, plug it into a DIFFERENT USB port and try once more. You may need to disable any 3rd party security software.
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