Hmm i wouldn't of thought it would brick it - you should just be able to boot off another card and re-flash.

If flashing to a reference BIOS doesn't work as you say, i would of thought there would be a suitable BIOS somewhere, it would just be about finding the right one.

I'm going to start taking more details down when i help people.

If anyone has been helped by this using a non sapphire card, can you please post the exact card you have and the exact BIOS you flashed with that worked.

Cheers