

I don’t think there are many tangible benefits if all you want to do is read. You’re likely using Calibre anyway for sideloading books and it converts everything to a compatible format automatically.
The only somewhat useful things the jailbreak allowed me to do is add custom fonts, custom screensavers, install KOReader as an alternative ebook viewer (although I rarely used it) and prevent updates because the interface became a lot worse after an update at some point.
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