Firmware update v1.0.3 is now available for the EOS 6D Mark II.
This looks to be a fairly straightforward fix, in that according to Canon it…
Corrects an erroneous display that may appear when some third-party accessories are attached to the hot shoe.
So if you have an EOS 6D Mark II, and use third party flash triggers for studio or other lighting then it would be a good idea to get your camera updated. Firmware is free to download and relatively simple to install yourself. Click the button below to download the firmware from Canon’s website.
Check to see if your camera has a firmware update
You can check the current firmware versions for all EOS cameras on the resources page.