Black screen, need to reset, plz help, super noob in programing

So I just got the watch recently, and by accident, i upload this in to my watch:

void setup() {
// put your setup code here, to run once:

}

void loop() {
// put your main code here, to run repeatedly:

}

I think this is the first thing pops up in arduino, and how do I reset the watch or change it to factory setting?
Thank you

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