So my 5D Mk3 started to not turn on once in a while and I took it into Canon Professional Services - I asked if they could leave firmware version untouched and they said now step one in any service is to upgrade firmware. Needless to say I now have 1.3.3 firmware installed and looks like no ML will run on that.
The phenomenon is fixed that in a multiple-flash shooting where the EF-X500 is used as a commander, flashes in some groups sometimes don’t fire correctly. Also in case the EF-X500 is used as a commander and the EF-60 as a remote flash, upgrade the camera firmware to the latest version. Fix of minor bugs. X-T2.
The folks at Magic Lantern are no stranger to adding new features to Canon DSLRs, courtesy of their EOS Camera Tool software. Their latest creation, Dual ISO, increases the dynamic range of the 5D Mark III and EOS 7D by four stops, bringing the total dynamic range to 14EV. This allows you to pull detail out of the shadows with a lot less noise

Mirrorless Cameras. The EOS R System is comprised of high-performance, full-frame mirrorless cameras along with compact lenses that take advantage of the R series design, so you get to experience the full scope of the EOS R system's capabilities. And, with a variety of mount adapters, you can utilize any EF lens as well, giving you an abundance

Firmware Version 1.1.3 is for cameras with firmware up to Version 1.1.2. If the camera’s firmware is already Version 1.1.3, it is not necessary to download this firmware. EOS 5D Mark III price check (should be in stock everywhere, at least in the US): B&H Photo , Adorama , Amazon USA , Amazon Canada , Canon Canada , Canon USA

Canon HDMI Camera Settings - Canon 1DC/ 5DMKII This section applies to the Canon 5D Mark III (firmware v1.2.3) and Canon 1DC (firmware v1.3.5). Please note that though the Canon 1DC can record 4K internally, the output is HD only. 1. SET CAMERA TO VIDEO MODE 2. SET INTERNAL RECORDING . 717 871 536 518 88 369 852 445

canon 5d mark iii firmware