Hallo Watnog,
welcome to mobileread!
Sounds like your library is corrupted. After deleting all the books the system seems to calculate to reorganise the internal database.
Did you delete the books completely or did you secure them on your PC? For some users here with your problem it helped to copy the books back to the Pocketbook (and eventually make another firmware update).
I had the same problem, too, with my device it was simply time that helped - suddenly the device started functioning again.
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