The Fire can be flaky about covers. In particular, if you initially send it an ebook without a cover it will often keep the "non-cover" even if you later resend it with a correct cover. If you leave it long enough the correct cover will eventually get recognized.
To check if you have a "good" cover in the ebook, open it (the first time it should open on the cover, but later it will open at the last read page), tap the TOC icon and select Cover. If Cover isn't one of the option, the ebook does not have a MOBI cover. As PeterT said, the safest approach is to get the cover you like in Calibre and then do a MOBI to MOBI conversion.
Note that the cover is in the MOBI ebook, there is nothing else to send. The Fire makes a local copy of the cover for its database. It is that image that can be hard to get the Fire to replace.
Last edited by wallcraft; 02-21-2012 at 10:59 PM.
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