Main BIOS has been corrupted?

[refmon]

Using GA-Z77X-UD3H and it just told me this and that it has used the backup bios. How exactly do i fix this problem? I've never done anything like this so I am scared of something going wrong.

[shadowsports]

This is in your manual 

Motherboards that support DualBIOS have two BIOS onboard, a main BIOS and
a backup BIOS. Normally, the system works on the main BIOS. However, if the
main BIOS is corrupted or damaged, the backup BIOS will take over on the next system boot and copy the
BIOS file to the main BIOS to ensure normal system operation. For the sake of system safety, users cannot
update the backup BIOS manually.