Ok. My E-Reader has Firmware 4.4.1772. So I've downloaded Pro4 archive, extracted it and copied it into my system folder. When I tried to open an ePub with it (it does appear in the list in context menu - "open with") it tries to load something (I can see the hourglass for a second then it just goes back to the library where I was when opening the book.
So it doesn't work. If someone has an idea about what can be done, I'm here to test it.
Meanwhile, I'm gonna factory reset it
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