Are you trying to reinstall A0RET on your A0? Go here:
Before using Arduino IDE with A0 for the first time, you must follow the instructions below to add ESP32 board definitions.
Connect A0 to your computer via a micro USB cable
Select "ESP32 Dev Module" as board type.
Upload a sketch. An easy sketch to adapt is the "Blink" sketch found in File>Examples>Basics>Blink.
Change the three instances of "LED_BUILTIN" to "13":
void setup() {// initialize digital pin LED_BUILTIN as an output.pinMode(13, OUTPUT);}// the loop function runs over and over again forevervoid loop() {digitalWrite(13, HIGH); // turn the LED on (HIGH is the voltage level)delay(1000); // wait for a seconddigitalWrite(13, LOW); // turn the LED off by making the voltage LOWdelay(1000); // wait for a second}
Press upload and the LED will blink every 1 second! 💡