The latest update (i.e. 2.0.7) requires a current firmware version of at least 2.0.4. Now I haven't updated my firmware so it's still at 1.0.6. For some strange reason Canon only lists the latest version in their download section for my camera. Is there another place where older firmware updates can be found?
Are you sure you can't use this update? Here's what it says:
"The Version 2.0.7 firmware being released this time is for cameras with firmware up to Version 2.0.4."
This implies it will work with any 5Dmk2 firmware up to that point. Have you tried? I can't find anything from Canon that says it will ONLY work on 2.0.4...