You have to correctly specify the encoding format, you can't just "use utf-8" if the source isn't utf-8. Find out what the source encoding is, and tell your conversion program (like calibre or whatever) to encode with that specific encoding when you convert the file.
Make sure it's not some strange dos/ansi encoding (windows), if it is, specify this encoding.
Though most text uses ISO/IEC 8859-1, or ISO/IEC 8859-2, ISO/IEC 8859-3, etc
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