I think your board has several versions of BIOS. MSI uses different a different BIOS on different versions of the same motherboard on selected motherboards. I'm assuming yours is a different version than those with the award BIOS.
See here - i pulled this off the MSI website:
"Some motherboards like the MS-6390 have different versions, in which each version uses a different bios"
It was in this page here (Under BIOS Flash Procedure 2b.): linky hurr!~