I tried on my Onyx Boox. E.g. the Russian and Dutch lines do not display correctly, but I can read Dutch and Russian books on my device without any problem, and without installing fonts. But then my Russian books are in fb2 format.
This looks like an ADE issue rather than an issue with the Onyx Boox. When I open the epub in ADE on the PC, I have the same display problems.
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