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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This is what I do too only I use Save to Disk instead.

You can then drop the mobi back into Calibre with the updated cover to overwrite the old one if you want. No conversion needed.