Ja ti nevim. V manualu na str. 1-33 je napsano:
BIOS1: Multi-BIOS Switch
This motherboard has two built-in BIOS ROMs (Labeled A and B, default BIOS ROM is A). If one is crashed, you can shift to the other for booting by sliding the switch.
Green LED + Blue LED

The blue led shows what BIOS is active.