Hi David, unfortunately I don't know which book (from ~600) caused the first error, or even if it was caused by a particular book. After doing a factory reset (but still running 4.31) I uploaded just 5 books (which I've uploaded before and so I think they're fine) and didn't get any errors. Libra 2 is behaving ok with these 5 books.
I'm not planning to mess around with reverting firmware or installing patches, but if you're sure the kobotouch_extended error relates to a book (and could not be caused by a corrupted database), I can try uploading some recent additions to my library, to try and narrow it down.
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