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Ok, so I had exactly the same problem. At least I thought so, So I converted books to mobi. Copied them to dropbox and attempted to open them from with in dropbox. Got the DRM msg. So I renamed one to prc and tried again. Same problem(DRM). Copied the books to Books folder internal file on the Fire. Books showed up and opened (both prc and mobi). So this does raise the question, if you have an external sd card, is there a external Books directory on the sd card?
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