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From looking at the info in the OP, it looks like the eMMC degraded and the sectors on the end are not working anymore. This is probably the internal controller in the eMMC, in fact the damaged flash sectors might be in another physical position.
It looks like a case of "send it to amazon and hope for exchange device".
Note that I don't think it's the USB connection. The errors on the Kindle itself indicate otherwise.
I have one question left: How did it break? Out of thin air or after doing something? It wasn't mentioned in the OP...
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