There's no reason why you shouldn't upgrade to 2004, it's stable and doesn't limit overclocking etc.

Just use the latest Asus Update application to do so.

Still doesn't fix the CPU multiplier bug on Extreme CPU's though, Asus is just so so poor when it comes to BIOS updates. It's always a case of if they can be bothered to do something rather than we want our product to be the best hence we'll give it the best BIOS like Intel does on their boards.