Firmware Version 1.0.2.1 for the EOS R5 C incorporates the following fixes and enhancements:
1. Built-in Mic Audio Off. The internal microphone on the camera body can now be turned off. (VIDEO mode)
2. Fixes an issue, in which, in rare instances, the camera cannot be normally operated when operating the REC button with the camera set to the [Continuous Recording] function.(VIDEO mode)
3. Fixes minor issues when using the CINE-SERVO lens. (VIDEO mode)
1. Built-in Mic Audio Off. The internal microphone on the camera body can now be turned off. (VIDEO mode)
2. Fixes an issue, in which, in rare instances, the camera cannot be normally operated when operating the REC button with the camera set to the [Continuous Recording] function.(VIDEO mode)
3. Fixes minor issues when using the CINE-SERVO lens. (VIDEO mode)
The firmware can be dowloaded by following the link at https://www.canon.co.uk/support/