After clicking the .dmg it creates a drive. Inside of it are the pdf and the fir files to either be copied to cf or accessed via the eos utility. Yeah. Tried it with 2.0.5 from canon and 2.0.3 from some other sites. Even found -1.2.3 and tried it.
Same error. Unable to locate firmware.....check the card, reset battery. It's on the card, in the right spot(root).the impression I am getting is that the camera is not looking in the right place. Would magic lantern do that. Maybe the former owner used it. I'm not that involved with it yet, still learning how to use the camera to its fullest potential.
What size is the memory card?
May not apply here; but I believe on some Canon cameras firmware update won't work on very large cards.
Yeah, I read that too in the instructions. I think they recommend under 64Gb cards. I think. I used a 16Gb one when I did it. What kind of CF is it? UDMA 6 or 7?