Try to install again BIOS version 99 with Recovery option. It is necessary to download and keep the file name BE0099.BIO Download BIOS Update [BEH6110H.86A]
in the root of a USB drive.
Then, remove the BIOS jumper from the motherboard, plug the USB drive to a black USB port of the back panel of the board, turn the system on and wait from 3 to 5 minutes. The process is automatic, it is not necessary to press any key.
It is recommended to use minimum configuration: motherboard, cpu with embedded graphics, 1 memory stick and power supply.
If you want to get into the BIOS using the maintenance mode, BIOS jumper needs to join pins 2 and 3.