Every SD cardreader does the trick. Many computers have one build in and in every household there are at least two SD card readers hidden.I updated the firmware for the R5 - great.
But ... I can't update the available firmware for my RF lenses because they can't just update the firmware with the R5 & lens connected to the computer. Instead you have to download a file and write it onto a card via a card reader (which they don't supply) and which I've tried to order but it's on backorder at BHPhoto. How dumb! My Olympus EM1 II was so easy to do anything with - just hook it up and that's it - update everything! - and they gave you access to the internal memory cards as an ordinary folder accessible to your computer - great! No software BS in the way! Why can't you just do this, Canon? Geez!