Canon will launch a firmware replace for the EOS-1D X Mark III in early April, as the corporate communicates through a product advisory:
To customers of the EOS-1D X Mark III
Thanks for utilizing Canon merchandise.
We have now confirmed that the next phenomenon can happen when utilizing the EOS 1D X Mark III DSLR digicam. A brand new firmware model is deliberate for early April; as soon as the brand new firmware is prepared we’ll make an announcement on our web site.
We sincerely apologize to customers who might have encountered any inconvenience as a result of this subject.
When the digicam is used with the digital degree set to "Show" within the viewfinder show, in uncommon circumstances, the digicam might not function usually when in use the AF-ON button or the shutter-release button.
EOS 1D X Mark III (firmware model 1.zero.zero)
Use the "Disguise" setting for the digital degree within the viewfinder show.
Setting process: Menu / Configuration tab 2 / Viewfinder show / Digital degree * (Disguise)
* Default setting: (Disguise)
In early April 2020, we plan to launch a firmware replace to fight the phenomenon listed above.
Please contact your nearest service heart you probably have any questions.