EOS R5 Mark II Firmware update not working

[cacanny]

I'm trying to update the firmware. The <OK> button on the <Firmware update program> screen is greyed out. The <Cancel> button is not greyed out, but does not work. The camera will not turn off with the <OFF LOCK ON> switch. The only way to turn the camera off is to remove the battery.

How do I fix the problem and update to firmware version 1.1.1? 

[Waddizzle · Accepted solution]

The touchscreen is disabled during a firmware update.  The camera is waiting for you to move the cursor from CANCEL to OK.  Use the rear dial to move it, and press [SET].

[cacanny]

Jez!... Thanks. You could spend the rest of your life trying to work that one out.