From Gigabyte support:
Dear customer,
Thank you for emailing GIGABYTE.
We would like to help you with your technical inquiry.
AMD Full Reset:
Please try a full reset of the motherboard:
Note: This reset will also set all bios values to default values.
Switch off power supply and wait 30 s
Remove CMOS battery.
Short-circuit the contacts in the battery holder for about 2s.
Remove short-circuit.
Reinstall CMOS battery.
Turn on the PSU switch.
Short-circuit the two pins of Clear CMOS jumper for 10 s.
Remove short-circuit.
Power up the system and boot to bios setup.
Apply your bios settings if you use other bios settings than default bios settings.