Unless you use the driver options in calibre to send the covers, the device uses the first page for the cover. But, replacing the cover can be a problem. Unfortunately, the device caches a few covers in memory. If the file is replaced, the cached copy is still used. The cover will be dropped from the cache when it is no longer needed. But, when reading a book, the cover will stay in the cache. And unfortunately, replacing the book or replacing the cover does not drop the cover from the cache. The only way I know to clear the cache is to power off and on.
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