This MB have Multi BIOS feature and system will automaticaly bootup from 2nd Bios chip and help you recover your system from failure.
Try the below steps to recover your sytem from bios flash failure:
Boot up your system and then press Del button to get in EFI BIOS Setup.
Choose Setting> Security > Multi BIOS Auto Update and Change default option to “Enable”.
Press F10 to “Save Configruation and Reset”, then choose “Yes”.
You will see the bios Flash process immediately after exit from bios setp,
Wait until bios update reaches 100%
then reset the system.
Note: Please do not turn off the system during the Bios Auto update procedure.