Here's how:
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1. Press the restart button. If there is a reaction, use the pen line to correct it.
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2. If the restart does not respond, charge the battery.
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3. If there is no effect, the touch screen may be faulty or the win CE system software is loaded too much during use, resulting in system failure. You need to go to the 4S shop and find professionals to brush the machine or change the screen.