I haven't been able to find a tbred update. The closest board on the asus website was A7VI-VM. But I suppose close doesn't count <s>. Its an hp, and thus I assume a proprietary thing. I did download a bios update from hp a while ago, but I don't recall it saying anyhting about granting hbred support.
I was just hoping that someone would be able to say that the tbreds are backwards compatable, and would work in anything designed for a palomino.