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How to Put Your Board into Download Mode

Download mode puts the ESP32 chip into a flash-able boot state, where your user code doesn't run. This is necessary for uploading new firmware to your board.

Steps to Enter Download Mode​

Follow this three-step button sequence:

  1. Press and hold the [BOOT] button down
  2. Press and Release the [RESET] button
  3. Release the [BOOT] button

Expected Changes​

When successful, your serial port connection will change:

  • macOS: The serial port name will change
  • Windows: The COM port number will change

Exiting Download Mode​

After flashing completes, press the [RESET] button to boot normally and exit download mode.

Updated on: December 27, 2024

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