Best way to jailbreak 5.7.2.1?
So I bought a used Paperwhite 3 (7th Gen) from eBay and it is currently running firmware 5.7.2.1 and I want to be able to jailbreak it solely for the ability to display book covers when it's locked.
I'm unsure of my options. Am I able to jailbreak the current firmware, or can I upgrade to a specific firmware that is able to be jailbroken?
If I am able to upgrade, is there a way to stop automatic updates from occurring to ensure that I don't lose the jailbreak?
I had a search through the forums but I couldn't find anything specific to the version that I'm on.
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