Canon has released new firmware for the Canon EOS-1D X Mark III, bringing the firmware to v1.2.1. This is a bug fix update.
Firmware Version 1.2.1 incorporates the following fix:
Firmware Version 1.2.1 also incorporates the following fixes and enhancements from Firmware Version 1.2.0:
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October 31, 2020 at 08:55AM