Looking at the schematics, the RST pin if pulled low, will do the same thing as if S1 is pressed. I assume S1 is the reset button.
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I don't have a CORE2, but from experience with some other M5Stack products the function of the reset button depends on whether the device is on external power (e.g. USB) or on battery power.
External power: restarts , battery power: shuts down. (but that is something you can test yourself)