Hello Quoth,
Thanks for your reply.
Calibre could detect my Onyx device in the previous release of Debian 10, and I recall that I had other file managers installed in my system. But after upgrading to Debian 11 (with pure installation), I did not install other file managers, but have only the default KDE file manager Dolphin.
Once again, thanks for your helpful reply.
Kind regards,
Aleksandar
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