Hi, I'm currently working on a project involving Bluetooth, sending and receiving data. Today, I had a problem with the USB drivers that I reinstalled along with all the arduino drivers. Since then, the Arduino have been sending me 0 or -1 even if i put Serial.println("Hello");. I tried different codes that worked before, plugged off the bluetooth, reset the board, it keeps sending me 0 or -1.
Edit: I also keep getting errors saying that the COM is already used.
Could you please help I'm stuck and I think I broke my board.
Thank you.