It's because the cell phone is running out of power.
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solution
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1. Connect the phone to the original data cable and charge it for a period of time.
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2, use a weak current to activate the mobile phone battery, connect the mobile phone connection data cable to the computer usb port to charge for a period of time.
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3, after-sales maintenance, carry mobile phones and purchase vouchers to the official maintenance center to test maintenance.
I hope my answer will be helpful to you