I charged the device for a while. Without disconnecting it from the charger, I did this:
I tried holding down the power button for more than 30 seconds and nothing happened.
Then I pressed and held a page turn button (the bottom one) and, without releasing it, then pressed and held the power button. After a short time the LED came on, but I didn't release the buttons. The LED went out and the screen changed and the reset process began (I think I have done a Factory Reset).
And that's it, now I have to start from scratch, but at least I didn't have to buy a new one.
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