Thus said Lilit-aibolit on Thu, 12 Apr 2018 14:39:04 +0300
I haven't tried via serial because I used vga+usb keyboard.However I'll definitely try that lan-serial port.
Did you get a chance to try the BIOS via serial connection? https://pt.aliexpress.com/item/Celeron-J1900-Mini-pc-free-shipping-micro-sd-two-usb-and-four-lan-laptop-overwatch-Computer/32794678352.html?spm
