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Sorry but what does NickelMenu have to do with bigger cover images? You can't even install KoboPatch options which is what you seem to be typing about at the same time as NickelMenu since they both use a KoboRoot.tgz file to install.
Unless you typed devmodeon in the search box and did a search so you now have a developer options menu item at the bottom of the Device Information menu (More => Settings => Device Information), you are not doing a real factory reset. Once you have enabled developer mode, then More => Settings => Device Information => Developer Options => page 3 => Factory reset your eReader for the wipe back to factory including factory firmware variety of factory reset.
As for the database issue, that is a well known issue and why I use NickelMenu to reboot my Sage before connecting to my computer.
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