There are a number of menu options in KOReader, including a power off, a Restart KOReader, a reboot device, and an exit. KSM has a Power Off menu option. You have the restrictions that come with the particular device you purchased, in this case buying an aura 2nd edtion, without a reset pinhole. The "holding the power button" has been a feature of the Kobos all along.
Luck;
Ken
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