ASROCK X299 User Manual page 31

BIOS B Select Jumper
(F_BIOS_B1)
(see p.8, No. 32)
This motherboard has two BIOS chips, a primary BIOS (BIOS_A1) and a backup BIOS
(BIOS_B1), which enhances the safety and stability of your system. Normally, the system
will work on the primary BIOS. However, if the primary BIOS is corrupted or damaged,
use a jumper cap to short the pins, then the backup BIOS will take over on the next
system boot.
2-pin Jumper
X299 OC Formula
Short: Boot from BIOS B
Open: Default
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