Quote:
Originally Posted by Katsunami
In addition to JSWolf's reply: first run Modify Epub (Calibre Plugin) with the Remove Embedded Fonts ticked to make sure the file has no embedded fonts to begin with.
If your file is an AZW3, you'll need to convert to epub first, or extract it to EPUB using KindleUnpack.
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But once it's been shifted to ePub via KindleUnpack, the technical errors will have to be fixed before Modify ePub can reliably be run on it. That involves using epubcheck as FlightCrew is not good enough and either Sigil or Tweak ebook.