Slightly different problem here: calibre 5 doesn't recognise either of my Kobos.
Tested with three different Mac computers, four cables and two readers (Clara and Glo).
All computers running Mojave; shall try with Catalina on the morrow and report any progress.
Now downgraded (no problem) to 4.23 and all seems well.
Happy isolating, all.
Olly.
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