Restoring the last non-corrupt backup should work; sign-out/sign-in will also work but will wipe your existing bookmarks and annotations and stuff.
No option in Calibre/Kobo Utilities; iirc that's a deliberate choice by the plugin author. You need to unzip your last good backup and then overwrite the files on the drive (look in the .kobo folder, I think it is) and then eject. Reboot the device for good measure.
If you're using 4.31 firmware, head over to the Kobo forum; there's been reports of it being a bit more prone to corrupt the db -- I've experienced it myself. If you don't need wifi or sync, reverting to 4.30 is more stable.
Last edited by ownedbycats; 03-09-2022 at 12:55 AM.
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