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You could use SVG image in the cover page such as;-
<body>
<svg width="100%" version="1.1" preserveAspectRatio="xMidYMid meet" xmlns=
"http://www.w3.org/2000/svg" height="100%" viewBox="0 0 490 750" xmlns:xlink=
"http://www.w3.org/1999/xlink">
<image width="490" height="750" xlink:href="../images/img0001.jpg"></image>
</svg>
</body>
the 490 and the 750 numbers are the size of the image you are using ..so change to match your image.
or
go into "convert E-Book" and add a image in the area marked "change cover image" .. that will change it, just in that one copy of Calibre you are running.
or
just drag and drop a image (and rename it cover.jpg) into the folder that holds the epub file.
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