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That sounds like you have a corrupt book or database that's causing your freezes.
To "reset" it: you should only need to hold the power button OFF for 20-30 seconds. The screen likely won't change although the light should go off. Wait another 10-20 seconds after you release it before trying to turn it on again. It won't accept ON input immediately after shutting off. The other option would be to try the pin hold in the bottom to reset it. But this really sounds like something specifically related to your device/books than a general firmware issue.
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