While I patch my Kobo, I don't jailbreak my Kindles. Too much bother for too little reward, for me. I can use custom fonts anyway, because I sideload my books in the azw3 format, not mobi. Screensavers aren't important to me and I'm fine with default margins and tap zones.
As to epub support, don't need it. I sideload all my books from Calibre, because I adjust the formatting in the Calibre editor. I never download anything to my Kindles directly.
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