I have been away a few days, but thank you all for your help!
To summarize answers to your questions:
I have been using calibre for many years without problems (Sony PRST01, Libra H20 since 2019 and recently the Libra Colour).
The databases were ok, as suggested in a previous post. I send books to main memory (the only memory) via calibre.
File extensions on the H2O on e.g. books I have read are .kepub. Changing the extension for new books to kepub.epub doesn't make a difference.
So far no succes with a "Boeken" folder (dutch for boring ;-)
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