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I just used a CF-card with ML 50D installed on it (I have to such cards). I figured that since it contained 50D, 60D, etc. fir-files adding the 5D file would work just fine. Also both CF-cards worked fine on both body's prior to adding 5D-files. After adding 5D file to one CF-card both did no longer work on 5D. It acted as I described.

The one I added 5D did not work on either body.
I managed to solve the problem (partially) by follow described steps in your users guide (to go back to canon firmware). It now works on 50D and 5D again. (Formatting my the CF-card on my mac did not work.)

The one I did not add 5D fir-file, still does not work on 5D but works fine on 50D. I guess I'll have to uninstall ML 50D and then re-install it to get it to work on both body's I guess.

Do you think I should also re-install canon firmware on my 5D?

p.s. At a given moment the 100CANON folder got renamed 100NIKON!?

Ah, figured out where the NIKON came from ... i copied it from a very old CF-card that worked on a NIKON ages ago to the new CF-card I had ML 50D and 5D installed on. Since it didn't have ML 50D installed I figured it might work on 5D and it did. Then I started copying the files to the corrupted CF card. I kinda lost it fearing the 5D died I guess ;-)

Just tested and same issue here as well:
1. Installing and Solid blue light
2. no rear inputs would work, no info in viewfinder. Buttons WB/AF/ISO working but shutter didn't
3. Removed battery put in regular card (ML 50D installed on it) didn't work
3. Removed battery put in regular card (without ML installed), worked fine. RELIEF! I thought the cam died!!!!

However,
- CF-Card with ML 50D installed still works in 50D but not on 5D
- CF-card without ML works on 5D (big relief) and on 50D
- CF-Card I used to install ML 5D seems dead on both camera's :-(
My question is how I can reboot it and make it work again or is it destroyed? Please help :-)


Serial: DS126901 3431300439

And how does this work on mac?