[Question Mark]

Originally Posted by mdp

In general, you will find many threads like the following (which could well contain the solution):
Android device does not show up in adb list (on StackOverflow)
https://stackoverflow.com/questions/...up-in-adb-list...

Thank you for all that. However, it may be several weeks now until I can look into it as things will get very busy at work for me now until about June.

Cheers.