Ok, here's something funny: I looked inside the firmware and found 2 fonts. Guess what, both have my much-needed diacritics! But why they don't display them, is a mystery to me.
I'd just like to say that I made my troublesome epub from a rtf file, would the encoding of the rtf be an issue? The .rtf is ansi-1252, not utf-8. Maybe the iRiver can't read ansi? When Calibre converts to epub, does it keep the encoding of the source?
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