Thanks for clarifications and apologize for incomplete details, you are right.
I'll try to reset the device and see what firmware has been upgraded, then I'll try to get a single book with Calibre Content server and I'll tell you the result.
If everything is ok, so I will try to import all the books, but it seems from what I read here that the best method is to bring the ebooks to Calibre and with the help of KoboUtilities to import them directly into the ereader.
I can tell you that the same books I imported without problems on a Nook GlowLight (it also shows me the file structure on the SD, which Clara does not do)
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