1. Every time the power is turned on again, the time will return to a certain point of time (more fixed as 2019.10.22 10:00),
2. If the power-on time is fixed to a certain time in a certain year and every time, it means that the BIOS battery is dead. Just replace the BIOS battery (this needs to be disassembled, no hard requirements can be replaced, it does not affect anything)
You can go online to replace the BIOS battery. It should be noted that T5 and T6 batteries are difficult to buy, and other models are easy to buy.
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