Herobook no bootable

Herobook Q64G19102562 received on March 6, 2020. Used without problems to date. Suddenly, when you turn on the power, the words “No Bootable Device.Hit any key.” I’m not an expert, what can I do?

Please contact Chuwi’s store customer service at the website where you buy the device

In which way? I have only Mr.lai6185 but not other address. My order was 5e5e9de54f416e7cdea3ee49.
Please help me.