OK, Many Thanks. Looks like I should be able to coax it to work using the steps you provided. I will try it tomorrow. I got tired of the thing today and gave it a rest…
Initially, I used Zadiag and it display more or less what was expected, and I was able to do as suggested in the notes. Subsequently, Zagiag does not display any COM Port details on the left side of the display, and nothing in the drop down.
The trick about : Arduino IDE, which then shows the Port greyed out. But it will program using DFU, even though an error message is shown
seems to be key as I had thought the compile/publish stage would not work if com port was not selected. I will give it a go, see where it leads !
I think the board designer has a lot to answer for. They could have selected a better USB chip that is much more compatible with Arduino. Other boards do not seem to have this problem.
My ancient 4 Y/O Windows 10 PC is part of my issue. Whilst you blithley say “you just have to close and re-open the IDE” for me that takes 5 minutes every time. I do wish that I had a Mac to do this on, but its looking I must wait until at least September before I can get my hands on a 16 inch Macbook Pro with M1x silicon. And, with a Mac, looks like this might have all just worked… I guess its one reason you pay so much for them.