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When I first got my 500, I registered my own account. My wife's 500 I plugged into my account to download a book I purchased so she could read it as well. I had to register her 500 on my account. When I did that, her books did not work. Had to register her 500 back to her account. Then her books worked and mine did not. I think it's the books are registered to the account & the devices.
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