Thank you for using Canon products.
Firmware Version 1.0.1 incorporates the following enhancements and fixes:
1. Fixes an issue in which movies captured in RAW/SRAW format may not play back properly on applications due to the attached lens and camera not communicating.
2. Improves the stability of the touch operation control when the [Touch control] is set to [Sensitive].
3. Fixes an issue in which the camera‘s LCD display may become abnormal after the camera resumes operations from the [Viewfinder off] state.
4. Fixes an issue in which the camera may stop working properly when the shutter button is operated while the BUSY message is being displayed on the screen.
5. Fixes an issue in which Err70 may be displayed when the display mode is switched between the LCD screen and viewfinder while the BUSY message is being displayed on the screen.
6. Fixes an issue, in which the camera’s LCD display becomes abnormal after using EOS Utility to capture and import movies.
7. Fixes an issue, in which movies captured using EOS Utility may not be played back on the camera.
8. Optimizes the auto white balance for specific environments when the Custom Picture function is set to [On].
If the camera's firmware is already Version 1.0.1, it is not necessary to update the firmware.
Further information:
EOS R5 Mark II Firmware Download Link