One caveat with this method... once you freeze nickel and grab the touchscreen exclusively, if your app crashes or gets stuck for any reason, there is no way to get out.
You can't power off or reboot the reader anymore, since nickel is the one processing those button signals, but you've frozen both nickel and the touchscreen so the device is unresponsive to all inputs.
I'm lucky since my H2O has a dedicated reset button/hole next to the USB port ( that still works ), but from what I understand newer models no longer have a reset button.
Without reset button I guess the only thing you could do is wait for the ereader to run out of power (or open it and disconnect battery physically).
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