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There is currently no reliable way to prevent firmware updates, except by never using Wi-Fi. There is a patch to block updates, but other users have reported it doesn't work. The good news is that if you ever do update by mistake, you can roll back to any firmware version you want by doing a manual update. Sideload mode removes the Home screen, so My Books becomes your new default menu. The large print mode in the beta features still works fine for me.
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