Yesterday my M92 froze ... it stopped responding to any buttons (including the "power on/off" button) and the screen was displaying the last visited ebook's page ...
I have found that the following sequence of actions does a "hard-reboot": first press the reset button in the hole on the back side of the M92 (I kept it "pressed" for something like 5 to 10 seconds, just to be sure) and then, immediately after you "release" that "reset button", press the standard "power on/off" button in the bottom of the device (just a short "click" is enough).
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