Denfenderland, I was copying the "multitasking" folder inside a folder I created in the internal memory (a folder called "updates"), and after restarting nothing happened. Then, as RobinDesBois suggested, I coppied "apps", "lib" folder and the update.oar file directly in the folder which appears when I connect my Boox to the computer (not in a folder called "root"), and it worked. Maybe it would also work if I copied the "multitasking" folder instead of its content.
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