I wants to use HC05 Bluetooth module with Arduino and I done all thing right, I connected 5v and gnd to Arduino 5v and gnd tx and rx of hc05 to rx and tx of Arduino respectively, and I am able connect it with my phone, but when I am pressing any button from phone the serial monitor showing me ‘?????’ instead of result

My code is:

// Define LED pin
const int ledPin = 13;

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  // Set LED pin as output
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // Check if data is available to read
  if(Serial.available() > 0) {
    // Read incoming data
    char incomingByte = Serial.read();
    // Print received data to serial monitor
    Serial.println(incomingByte);
    // Check if incoming data is '1' or '0'
    if(incomingByte == '1') {
      // Turn on LED
      digitalWrite(ledPin, HIGH);
    } else if(incomingByte == '0') {
      // Turn off LED
      digitalWrite(ledPin, LOW);
    }
  }
}

What could I do to fix it