Gorgonops said:

(I get a terrible headache every time I try looking up information on flashing cards for Macs, that's why I've never done it.)

Click to expand...

Do you have a chip programmer.   I find that it's often easier to desolder the firmware chip (typically an 8-pin SOIC Serial Flash) and read/program it on a chip programmer than it is to do all the gymnastics to flash the card in a machine.