Hey everyone, not sure if this has been shared or not. I accidentally flashed the wrong BIOS to one of my RX580s. I found a way to reflash the GPU with original BIOS if this does happen.
1) Reboot PC in Safe Mode (to be able to do this with bad GPU, you need to unplug the bad one until the PC restarts with options to reboot in safe mode, once you get to the screen to select, plug it in the PCI-E slot)
2) Go to Device Manager and disable the bad GPU
4) Reflash with AtiFlash with original ROM
It should work again!
Hope this helps anyone out there.