I have successfully jailbroken my PW3 G090 using "file://" method. Everything went smoothly on first try even without Factory Reset.
If anyone finds this useful, I first updated from factory 5.6.1.1 to 5.6.5, then copied files to kindle root, loaded index.html from kindle browser (ignoring the message that I'm on airplane mode, access to local files still works obviously), followed instructions, ran ;fc-cache in search bar, got Jailbreak successful, installed hotfix via Update my kindle, installed KUAL by copying azw2 to documents, installed MRPI and added some extensions which showed up in KUAL menu.
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