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IIRC, PW1 is the only model that still can be downgraded from firmware 5.6.x using the "reboot before disconnecting from PC" trick.
Try that. Download 5.4.4.2 update bin from Amazon, connect Kindle to your PC and copy the bin file, DON'T unmaunt/disconnect PW1 from the PC but press and hold Kindle's power button untill it restarts. It the trick still works it should start "updating" to older firmware.
If you disconnect the Kindle from your PC it would just delete the older firmware bin update file you just copied...
As for latest gen PW model (or Voyage or Oasis) you would still need to downgrade, that is install "initial"/"factory" firmware build which can be jailbroken.
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