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I did that myself last night, and the cover changed to what I wanted - converting a book from Epub to Epub in Calibre hadn't worked.
With your reader hooked up, go into the its databases until you get to your target book's entry of "main_thumbnail" (the item you are trying to change). Transfer your desired image to that location, delete the existing (previous) item, and then change the name of the new (transferred) cover image to "main_thumbnail" ... when you next check, that'll be your new cover!
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