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This usually happens if the firmware/software is glitched. First we can soft-reset the Kindle and see if it works or not. Press and hold down (or slide) the Power button for full 40 seconds and this will reset the Kindle. Then try to open your books.
Please let me know if that didn't work, so we can continue troubleshooting
Hello there, I'm just checking. How is it going ? Were you able to reset the Kindle ?