I'm not sure if this is off topic but I didn't want to take a chance. I've been using Librera, which is an ereader, instead of Moon+ because it got stuck. Also, Librera is supposed to be able to handle formats other than pdf and epub, which Nook cannot do. I have tried document viewer, though I think it has too many drawbacks. Anyway, I've noticed that some titles are mentioned multiple times. How do I delete all the copies except one? Additionally, it seems not to be capable of dealing with some formats, such as rar, although it lies that it can.