Hmm...
Was the error message actually "Internal Error"?
Or was it "Your Kindle Needs Repair"?
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Your other posts are about problems with e-books that you create - -
Have you tried to remove **all** of the books from your device and then doing a "Reset to (factory) Defaults"?
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Did (do) you have OTA updates blocked?
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What was the problem that you where trying to solve by registering and de-registering the device?
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