Since upgrading to the 2.1.0 firmware for my EOS R5, hitting the record button in stills mode no longer works, and I have to annoyingly hit multiple buttons to switch to video mode (I use C3 anyway) in order to be able to record.
I've seen that this can be due to using settings incompatible with an SDCard, but in that case the C3 movie mode wouldn't work either and show the same "00:00" warning. In my case, C3 recording works fine, plus I am just using a CFExpress card. I'm not sure if its related, but I just noticed also that tinkering with my settings in C3 such as digital image stabilization, 4K HQ mode, or Canon Log settings, all get reset when leaving and returning to the mode.
