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| p.3 #5 · Official: Canon EOS 5D Mark III Firmware v1.2.1 |
Actually yes, you can reverse it. Just to see, if I can go back, I d/l 1.1.3 FW and successfully reversed to it on the camera. Put it on SD card, click on update, camera recognize the FW, asked me if I want to update, click OK and off it went...I am using ML so is good to know, I can reverse to 1.1.3 any time.
BTW, there is new manual, reflecting the changes in menu - I d/l from Canon Australia