So, I accidentally loaded my 6970's Bios onto my 5870. I never backed up the 5870 (Diamond reference) Bios, and I spent hours trying to reflash it. I use Ubuntu 11.04, and was using a DOS booting USB drive to atiflash the bios. Atiflash no longer recognizes the 5870 when another card is plugged in as the main. Using -i it only shows the 1 working card, and using -p 1 it says there is nothing available. I tried blind flashing the ati stock bios, as well as Diamond and Asus versions with no luck (I couldn't see but I suspect I'm getting the same error using -p0 when blind that shows up with -p 1, no card available).
Is there another way I can get the system to at least acknowledge that the 5870 is plugged into the PCI-e port? The fan is spinning, and there wasn't a burning smell or anything so I suspect the hardware is undamaged. Definitely never making this mistake again.