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Can confirm this does not work in its current state on PW3 5.15.1.1.
I've built a modified payload that replaces the squashfs archive that contains the keys with a pre-modified one, and then re-constructed the jailbreak hotfix and KUAL hotfix with KindleTool to raise the OTA boundary.
Doing these things seems to have worked fine as I am now running KUAL on a previously stock 5.15.1.1 PW3, in theory this should work for the models that the PW3 jailbreak hotfix also supports.
I hope me attaching these modified binaries isn't going to be an issue, to use the modified popcorn payload just replace the uImage with the one attached, and then after reboot copy the hotfix, use UYK to install it, and then install KUAL as usual substituting the normal hotfix with the one attached.
I of course can not guarantee that this will work for you and that it won't damage your device, it is destructively replacing the uks.sqsh image and if something goes wrong it might turn into a bigger issue, but as long as you get past that point the rest should work as usual.
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