I'd recommend running a BIOS recovery instead of a BIOS update, to attempt to fix that issue.
To perform a BIOS recovery on this motherboard, you need only to put the BIOS update files on a USB flash drive. The BIOS recovery file is the *.BIO
Then, while the system is off, connect the USB flash drive and remove the BIOS jumper from the motherboard.
Finally, boot the system. The recovery should start automatically.