Hi
Well your first error was in using @Bios to flash the Main BIOS. What you needed to do is to use the same file but install it via QFlash the BIOS utility. It is much safer.
You can try reflashing the Main BIOS first and once you are happy that it is working ok you can then synchornise the Main BIOS and the Backup BIOS by following these instructions.
Please also confirm for me your BIOS chips have matching BIOS versions in them, if not this can sometimes occur as well.
To check, go into the BIOS and on the MAIN page press F9 for system info. You should see both BIOS versions listed, if they do not match please update the backup BIOS to match the current.
To do that, reboot and where you would normally press DEL to enter the BIOS, instead press Alt + F12, this will flash the Backup BIOS with the MAIN BIOS contents. Do not worry when you see a recovery comment, that is normal and means it is flashing the backup BIOS.