ASROCK Fatal1ty Z97X Killer/3.1 Series Manual page 24

BIOS Selection Jumper
(BIOS_SEL1)
Default
Backup BIOS
(see p.1, No. 18)
(Main BIOS)
This motherboard has two BIOS onboard, a main BIOS (BIOS_A) and a backup
BIOS (BIOS_B), which enhances protection for the safety and stability of your
system. Normally, the system works on the main BIOS. However, if the main BIOS
is corrupted or damaged, please use a jumper cap to short pin2 and pin3, then
the backup BIOS will take over on the next system boot. After that, use "Secure
Backup UEFI" in BIOS setup utility to 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. Users may refer to the BIOS LED (BIOS_A_
LED or BIOS_B_LED) to identify which BIOS is activated currently.
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