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You can abandon your attempts, it's bricked a since you can't even do a debrick using USB to TTL adapter (even if you had the necessary equipment to open Oasis without braking the screen) it's dead and useless forever.
Any Kindle model released after the PW3 is basically non-repairable (at least not without writing the software directly to the eMMC chip) once it gets truly bricked to that point when it doesn't even export the storage space over USB cable.
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