The chip needs to be in download mode (0xb)

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1

Hey Guys,

I've a problem during Uploading to my Devboard (ESP32-WROOM-32U). After the see to 'Connecting..........' on output terminal , I get the error 'A fatal error occurred: Could not connect to ESP32: Incorrect boot mode detected (0xb)! The chip must be in download mode. '

I also tried the solution of holding the BOOT button pressed during download, but it continues to work the same way.

// Pin assignments 
const int inputPins[8] = {32, 33, 34, 35, 36, 39, 25, 26};   // INPUT pins
const int outputPins[8] = {2, 4, 5, 18, 19, 21, 22, 23};     // Relay Output Pins

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

  // Set inputs to INPUT
  for (int i = 0; i < 8; i++) {
    pinMode(inputPins[i], INPUT);
  }

  // Set outputs to OUTPUT
  for (int i = 0; i < 8; i++) {
    pinMode(outputPins[i], OUTPUT);
    digitalWrite(outputPins[i], LOW);  // Keep relays closed at startup
  }

  Serial.println("Enter command (1-8):");
}

void loop() {
  // Constantly check the input pins
  for (int i = 0; i < 8; i++) {
    if (digitalRead(inputPins[i]) == HIGH) {
      digitalWrite(outputPins[i], HIGH);
    } else {
      digitalWrite(outputPins[i], LOW);
    }
  }

  // Process commands from serial terminal
  if (Serial.available()) {
    char cmd = Serial.read();
    if (cmd >= '1' && cmd <= '8') {
      int index = cmd - '1';
      digitalWrite(outputPins[index], HIGH);
      delay(500);  // Keep the relay ON for 500 ms
      digitalWrite(outputPins[index], LOW);
      Serial.print("RELAY ");
      Serial.print(index + 1);
      Serial.println(" triggered.");
    }
  }
}
2

How many times did you try?
Did you hold down the BOOT button as soon as it said connecting, and continue holding?
I think another procedure is to hold down BOOT, press reset, release reset, release BOOT.
I often have to try more than once, and sometimes I need to restart the IDE. It can be finicky.