It may, but I kind of doubt it as the Biostar TA790GX A2+ does not list support for the 955. First, though, try clearing the CMOS setup and resetting it to default.
Note: Be aware that even if you do everything right, there are several things which may go wrong when flashing BIOS; each of which may render your board unuseable.
Note: Be aware that even if you do everything right, there are several things which may go wrong when flashing BIOS; each of which may render your board unuseable.