"Calibre", which has a forum here, is great at converting from many formats to ePub.
It also has a "Page Setup" Output profile = "JetBook 5-inch", that should match your
Libre's display.
You will need to remove the DRM from your purchased eBook, for Calibre to be able
to work with the book. The fact is that, to obtain the most out of your eReader, you
will need to learn how to remove the DRM. Unfortunately, most of the world has taken
the position that removing the DRM somehow contributes to the theft of the ebook,
and have allowed the practice itself to be deemed illegal. Therefor sites like this are
unable to provide links or direct instructions to remove the DRM from the books you
have purchased and want to use on the device of your choice.
You might be able to find, using Google perhaps, a means to convert your "ereader"
files 2 HTML that Calibre would be able to work with.
Luck;
Ken
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