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Hmm, I vaguely recall some hack related to this that came up many years ago. Something about taking a screenshot on every page and saving it to the image that gets displayed when the device is off. Perhaps I saw it in the Russian forums that PocketBook frequents? I'm not sure how you'd do this automatically in all applications. Maybe it only worked within a hacked version of coolreader, or something? Anyway, I recall that the hack was kludgy and buggy, and you'd only use it if you were truly desperate for that feature.
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