The Mining edition of these cards don't have switchable bioses. I checked anyway, but they don't.

I tried downloading SRB Polaris V3.5, but it somehow doesn't work for me. Pimp my straps, strap editor and any other options don't work. I tried version 3.0 and that one works, but it doesn't have pimp my straps option.

After trying some other things I figured out, that the tool completely works for a different BIOS (from a RX580 8GB). Weird...