Why does the screen and LED light up briefly after replacing the battery, but then immediately shut off and fail to turn

If the device is completely out of power, the internal power supply for the RTC will also be depleted. To protect data and ensure the system time remains correct, the device will be compulsively locked (shutting off immediately after turning on). In this state, it is recommended to connect the device to a PC with a USB  cord and link it with the DLV software, in that way, PC will provide temporary power (not to charge the battery), and also the system will automatically calibrate the time. After replacing a new battery, press the , and buttons simultaneously to reboot the device.

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