Quote:
Originally Posted by Saturday
I've found that you don't have to do a mobi to mobi conversion if you use Calibre's Send to Device option after editing the metadata. If you copy it over manually then the cover change doesn't stick without a mobi to mobi conversion.
That's the way it's always worked for me, at least, though I'm not technically adept enough to know why it works that way. 
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Yes - if you use Calibre's "Send to Device", it sends over not just the ebook file, but makes a folder, and copies over a few other things including a cover image. This isn't part of the ebook file. In fact, you can use this to change the cover, title, and/or author of a book with DRM, since Calibre isn't changing the ebook file.