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Delete all your books and hard / factory reset. That should do it. But it sounds like you've already done that. If you do a factory reset, I figured it would reset to original FW. It doesn't? Then you need to get it to original FW maybe. I appreciate you've already tried this stuff. Sorry I can't be more help.
Do you have an SD-card in there? Remove that too. This is why I no longer buy new. I had a 650 that died on me (faulty power switch connected mobo) after about 15 months. Never again. If it doesn't work out for you, I recommend ebay.
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