I think I did everything to solve this problem:
- sign out/sign in
- another (new) USB cable
- another USB port on my laptop
- downgrade of the Kobo firmware just to be sure
- factory settings reset (twice)
and nothing helped. As soon as Calibre 'sees' my device, there is the error message. When I try to see what is in the main memory on the device, there is nothing (although there are books on the ereader).
Strange thing is, I can still upload books to my Kobo Sage via Dropbox but I don't like that method, I vastly prefer Calibre.
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