Well, i have come across a ton of links for updating the bios on the ati cards, but unfortunately, the OEM bios you are looking for hasn't been in anything I have DL'ed, you might want to go to a specific ATI support site..(like rage3d.com...etc etc etc...) and post a thread in one of their forums, somone has got to have it, just a matter of time......i'll still be on the lookout for it, seeing i never found it so difficult to find something like this..(heh heh...now i have to find it...heh heh) and i'm still awaiting a reply to the e-mails i sent out..
I'll keep you posted...