It looks like erased bios, same happend to mine during windows restore. No blue led at all.
I had to open tablet and use the SPI programmer, BIOS chip was blank.
Be carefull chip W25Q64FW is 1.8V, needs converter from 3.3V.
https://www.aliexpress.com/item/Free-shipping-Bios-Board-MX25L6405-W25Q64-USB-Programmer-LCD-Burner-CH341A-Progammer-for-24-25-Series/2036622392.html
https://www.aliexpress.com/item/1-8V-adapter-for-Iphone-or-motherboard-1-8V-SPI-Flash-SOP8-DIP8-W25-MX25-use/32702717415.html
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