I need to hard reset (or seriously breathe life) into a stuck Arduino clone which doesn't get recognized by Windows (error 43) after installing the wrong Sketch.

The problem is probably that I am writing to the serial in the setup() section like this:

void setup() {
  pinMode(a0, OUTPUT);
  pinMode(a1, OUTPUT);
  pinMode(a2, OUTPUT);
  pinMode(b1, OUTPUT);
  pinMode(m0, OUTPUT);
  pinMode(m1, OUTPUT);
  pinMode(m2, OUTPUT);
  pinMode(OK, OUTPUT);
  pinMode(KO, OUTPUT);
  
  pinMode(carry, INPUT);
  pinMode(result, INPUT);
  delay(1000);
  
  Serial.begin(9600);
  Serial.write("Arduino Tester v. 0.1\n");
}

Arduino seems to be running the code. The problem is that Windows doesn't recognize it and doesn't set up a COM port for it.

So: i'd like to nuke it and restart from scratch.

How is this done?