How do i get the modle # of the mobo

My friend has a pentium 2 asus mobo and is wanting to update the bios and f disk it, well she already ddi that, but now we need the bios for it, how do i find out what the modle # is, from asus i found out the pentium 2 mmx was a slot 1 mobo but there are 47 differnt choices of boards. How do i find out which one is the right one?

If the computer is running you can download sissoftware sandra and in the main menu click on mainboard options and that will tell you the model and alot more