If the books were bought from B&N:
- Make sure they are not ereader format books (".PDB"). The Nook Classic is the only Nook model supporting ereader books.
- Make sure there is only one dot in the filename (".EPUB"), remove all other dots from the filename.
- Copy one of the books from the SD-card to the internal memory of the Nook to see if that makes a difference.
If the books are non-B&N books:
Make sure your Nook is authorized in ADE (Adobe Digital Editions).
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