My use case may be a little different than OP but I was able to get a few books syncing between inkpalm5 and Libra 2 by using the Modify epub plugin for calibre and sending the modified files to the Libra 2. I believe my Libra 2 still had kepub files from prior to when I used KOReader as a default reader on the device.
I am having trouble syncing a book I purchased from Amazon sync after converting to epub after following the steps above. Stefan Svartling’s recent video on YT helped.
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