This BIOS update is only for 
***Winbond 977EF I/O Chip (Winbond 83977EF)***

Do NOT use it with other chips from the 83977EF series (83977EF-AW, etc.), i.e. if you see a dash ("-") after "83977EF", do NOT flash your BIOS with this BIOS update because the board won't be able to boot.

I/O Chip is located near the edge of the motherboard, close to the fifth PCI expansion slot.