Reset the Arduino bootloader on the Nano ESP32 [HC-1351]

content/Hardware Support/Nano Family/Reset-the-Arduino-bootloader-on-the-Nano-ESP32.md

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+---
+title: "Reset the Arduino bootloader on the Nano ESP32"
+---
+
+Learn how to reset the default Arduino bootloader on the Nano ESP32 using Arduino IDE.
+
+These are some reasons you may want to reset the bootloader:
+
+* Update the Arduino bootloader already on the board. This can resolve issues with Nano ESP32 being misidentified as other ESP32 boards.
+* Restore the ability to upload regular Arduino sketches to a Nano ESP32 that has been flashed with the MicroPython firmware.
+
+---
+
+Before you begin, it is recommended to have the latest version of the **Arduino ESP32 Boards** or **esp32** boards package installed using the Board Manager.
+
+Follow these steps:
+
+1. Connect a jumper cable between the **GND** and **B1** pins. The RGB LED will turn on with a green or blue color.
+
+   ![The GND and B1 pins](img/nano-esp32-gnd-b1.png)
+
+2. While the **GND** and **B1** pins are shorted, press the white **RST** button on the top of the board to reset the board to **firmware download mode**.
+
+3. Remove the jumper cable. The RGB LED should stay on, in a purple or yellow color.
+
+4. Open Arduino IDE.
+
+5. Go to **Tools > Port** and select the board (it may be identified as an arbitrary ESP32 board).
+
+6. Go to **Tools > Board** and select **Arduino ESP32 Boards > Arduino Nano ESP32** (or **esp32 > Arduino Nano ESP32** if you're using the full esp32 package).
+
+7. Open **Tools > Programmer** and ensure **Esptool** is selected.
+
+8. Select **Sketch > Upload Using Programmer** to begin uploading the firmware.
+
+   The process is complete when you see these lines:
+
+   ```
+   Leaving...
+   Hard resetting via RTS pin...
+   ```
+
+9. Press the **RST** button on top of the board to exit firmware download mode.