ASROCK X99 Taichi, Manual

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2.7 Smart Switches
The motherboard has two smart switches: Clear CMOS Switch and one BIOS
Selection Switch, allowing users to quickly clear the CMOS values or boot from
different BIOS.
Clear CMOS Switch
(CLRCBTN1)
(see p.3, No. 15) Clear CMOS Switch
allows users to quickly
clear the CMOS values.
BIOS Selection Switch
(BIOS_SEL1)
(see p.1, No. 25) BIOS Selection Switch allows
the system to boot from either
BIOS A or BIOS B.
This function is workable only when you power off your computer and unplug the power
supply.
A B
This motherboard has two BIOS chips, a primary BIOS (BIOS_A) and a backup BIOS (BIOS_
B), 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, just flip the
BIOS Selection Switch to “B”, then the backup BIOS will take over on the next system boot.
After that, use “Secure Backup UEFI” in the UEFI Setup Utility to duplicate a working copy
of the BIOS files to the primary BIOS to ensure normal system operation. For safety issues,
users are not able to update the backup BIOS manually. Users may refer to the BIOS LEDs
(BIOS_A_LED or BIOS_B_LED) to identify which BIOS is currently activated.