Not helpful for me to say, I'm sure, but... Are you sure the card even has a flashable bios chip? Flashing video card bios-es wasn't really a "thing" during the Rage Pro era to my recollection. (which may well be faulty)
To be honest , I am not sure if it is directly flashable from a computer, but it does have a bios chip that I removed (from the PC Card) and dumped with a programmer, so the process shouldnt be too difficult to do on a Mac edition card if some one has one.
I've not heard of flashing these cards, you'd be best off finding an ATI Rage 128 (from a blue and white G3) or a PC Radeon 7000 you can flash over yourself.
Ive actually got a Radeon 7000 coming from china, but the problem is that the shipping will take quite a while and I actually want two card, as I have a G3 sitting here aswell.
