Considering I'm somewhat of a PC Luddite, and avoid updating my BIOS, Windows, or drivers unless it's critical, flashing my GPU BIOS was certainly out of the ordinary. I've known about custom vBIOS ...
There are reports going around of end users successfully flashing RX 480 boards with RX 580 BIOSes and picking up extra performance in the process. While it's an interesting idea, this is one project ...