How does one find the firmware to downgrade from 1.2.1 to 1.1.3 compatible with Mac? I'm obviously wanting to install Magic Lantern on my Mark III, but I am having difficulty finding a Mac tutorial. Any help with the aforementioned would be greatly appreciated.
On the same issue, was this ever resolved?
You don't need anything Mac specific to upgrade/downgrade the camera's firmware. You just need the 1.1.3 .fir file to copy on to a memory card and then flash via the Canon menu.
http://www.magiclantern.fm/forum/index.php?topic=5383.0
here's the firmware...good luck.