On October 3rd, Canon released the new firmware version 188.8.131.52 for the Canon EOS R5 C mirrorless cinema camera.
Make sure that you download the correct firmware for your computer (Windows or Mac).
Firmware Version 184.108.40.206 incorporates the following fixes and enhancement:
1. Built-in Mic Audio Off
a. 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)