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Originally Posted by DNSB
As far as I recall, the sign out/sign in will not remove any ebooks on the internal storage nor will it change the running firmware version.
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No, this will trigger an update check. It is done whenever setting up a user. If Garu wants to stay on a particular firmware version, he will have to use the desktop app.
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Using Calibre and davidfor's Kobo Utilities plugin, you can backup the database and in theory revert to a copy before the corruption. I've never used the restore procedure myself since I think of my ereader as device for reading books so losing the reading stats doesn't bother me.
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Restoring a recent database backup should work. And the plugin can store the reading status of the books but not the actual statistics.
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The pinhole reset is like resetting or power cycling your computer and will not repair existing corruption. I've used it when I managed to hang my Kobo so badly that holding the power switch to power it off did not work.
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There is a chance that a pinhole reset will cause the database corruption. If it happens the wrong time, then it will. Of course, it is just as likely that whatever caused the need to do a pinhole reset had already messed up the database.
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Generally, I'll try a sign out/sign in. If that doesn't fix the issue, I'll try a factory reset. If that doesn't work, if the device has an internal uSD card, time to rewrite the card otherwise hope for a miracle.
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That's about right. Depending on the exact problem with the database, sometimes you can fix it. This mainly works if the indexes are corrupt. Rebuilding the indexes or doing a compress can fix it. I doubt it is the case here.