Get the Bios update utility from biostars site. http://www.biostar.com.tw/app/en/mb/introduction.php?S_ID=560#dl
Here are instructions on how to use the update:
1. Install BIOS Update Utility.
2. Download the proper BIOS from http://www.biostar.com.tw/app/en/mb/introduction.php?S_ID=560#dl
3. Open BIOS Update Utility and click the Update BIOS button on the main screen.
4. A warning message will show up to request your agreement to start the BIOS update. Click Yes to start the update procedure.
5. Choose the location for your BIOS file in the system. Please select the proper BIOS file, and then click on Open. It will take several minutes, please be patient.
6. After the BIOS Update process is finished, click on OK to reboot the system.
7. While the system boots up and the full screen logo shows up, please press the <Delete> key to enter BIOS setup. After entering the BIOS setup, please go to the Save & Exit, using the Restore Defaults function to load Optimized Defaults, and select Save Changes and Reset to restart the computer. Then, the BIOS Update is completed.