What is 2-2 dfu Arduino IDE 2.1.1 ?

Official Hardware Nano Family Nano ESP32
4

This is what I am getting this morning:

  1. I wrote a very simple C program, edSquares.ino
  2. From the drop-down menu I selected “Arduino Nano ESP32 Com6”
  3. I pressed upload button
  4. Upload successful
  5. Without me touching anything, the drop-down menu now reads “Arduino Nano ESP32 2-2”
  6. I changed back to “Arduino Nano ESP32 Com6”
  7. I tried to open Serial Monitor
  8. I got the message: “Port Monitor Error: command ‘open’ failed. Serial port busy. Could not connect to Com6 serial port”

My setup is a new Samsung PC laptop running Windows 11 connected via USB C cable to Arduino Nano ESP32 board.

Here is my sketch edSquares.ino:


int j = 1;

void setup() {
  Serial.begin(115200);
}

void loop() {
  for( j=1 ; j<30 ; j++){
    Serial.print(j);
    Serial.print(" ");
    Serial.println(j*j);
  }
}