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I'm not sure if this would work on yours or brick it. I had several PW1 which for some strange reason would register under 5.3.9, but not under later versions.
I was able to successfully downgrade the OS from 5.6.1.1 back to 5.3.9 by forcing it to update (downgrade) while still connected to the computer.
Attached to computer via USB. Transferred the 5.3.9 update bin file to the kindle.
DO NOT eject from computer. Instead, hold kindle power button until it goes into update mode. This skips the usual checking on disconnect that made sure you were not putting in an older update file than what was installed.
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