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Do a hard reset. Hold power, select "restart" in the menu that shows up. After the reset, leave your device alone for a few minutes. It can take a while for all the content to show up. Also, look how much space is on your device, and free it if needed.
Something similar happened to me as I ran out of space. I was filling my Kindle with screenshots and didn't notice that all my space was filled. Koreader softlocked itself, then Kindle OS had some problems booting up. Freeing some space and reset, fixed it for me.
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