I solved it :-) I tried to connect PocketBook to a PC, but PocketBook did not ask me, if I want connect or charge. But then I pushed accidentally the power button (my shorcut to recent books - I forgot it) and from menu I selected one of my books. I connected it to PC and PocketBook asked me, what I want to do. So I was finally able to connect 902 to PC. Deleting the PDF did not help, so I backed up and then deleted everything. And it works:-) It was something wrong with the main menu, I think…
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