Canon has released new firmware for the Canon EOS-1D X Mark III. This firmware fixes an issue that was present in version 1.7.0.
In firmware version 1.7.0, it has been confirmed that the power may not turn on immediately after the update is completed under certain conditions, so we will release a new firmware version 1.7.1 that incorporates the fix.
This firmware incorporates the following fixes:
This article was originally posted by Canon USA - March 30th, 2023