Larkbox Input Voltage

What is the DC input voltage range for the Larkbox. I know the nominal voltage is 12V. Can it run off standard 13.8VDC? What is the range of DC voltages that it will operate on?

I have purchased the Chuwi Lark box before 2 months. It was working well. But suddenly it’s not get power or display. I have tried with several Power Adapter even the power adapter which is comes with it working well with other device.

I have found similar code or serial no back of the box like: Q128G2092434

Please help me to resolve the problem.

Do you have agent or service center in Bangladesh who can assist me.

Thanks and Best regards