Well I can't very well help you if you don't share the info that you do have.

What is the make and model of the motherboard ?
What is the bios string ?
What version bios are to trying to upgrade to ?

You have to give me something to go on.

and if you don't mind me asking..

Why do think you even NEED to update your bios ?
Are there issues that you're sure you're going to resolve by doing this ?


And it wouldn't hurt to ask the folks at motherboards.org ..
the ole "two heads are better than one" theory..