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Do a hard reset. Both "-" buttons + reset button.
You'll get a screen asking you to press Y or N. Press Y to erase all personal data and reset the device to the ROM's default settings. Depending on your version, it might ask you to press spacebar after that. When the device reboots it will go through the whole screen calibration and all of that, just like it came out of the box for the first time.
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