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It is a really really BAD IDEA to use Calibre to convert ePub > ePub. You can get some really unexpected results that you don't want and it changes the code so if you ever want/need to dive into the code, it might not be as easy to do as it was before the conversion. If you want to change the cover image in an ePub, use either Tweak ePub or Sigil.
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