Yesterday I happened the same problems as you.
Update Bios with the biostar windows bios utility and then appeared Bios Checkum error.
Lot of trays, lot of bioses, lot of awdflash version and always errors!
Finaly works with this combination.
Award flash utility ver: 8.20a
Settings: /py /sn /cd /cp /cc /LD
Note this. --> "/LD" --> Destroys CSMOS Checksum And No System Halt For First Reboot After Programming.
Bios: N325a826 BF (Lastest).
You can download the .rar file with al these tools at: