Arduino Uno R4 wifi board is recognized as an ESP board when connected to Arduino IDE

Official Hardware UNO Family UNO R4 WiFi
7

This indicates the standard firmware on the "bridge" module of the UNO R4 WiFi board has been replaced or corrupted. That could happen if you accidentally uploaded a sketch while the bridge module was in the boot mode (as happens when you do a firmware update), or perhaps if the firmware update procedure failed.

The board can be recovered by flashing the standard firmware to the bridge module. The tools we normally use for updating the firmware can't be used when the board is in this state, so it is necessary to use a command line procedure.

I'll provide instructions you can follow to do that:

  1. Disconnect the USB cable of the UNO R4 WiFi board from your computer.
  2. Use a jumper wire to connect these two pins ("DOWNLOAD" and "GND") on the 2x3 male header that is near the USB socket on the UNO R4 WiFi board:
    labeled header pins
    labeled header pins1181×906 73.7 KB
    📷

    Arduino - CC BY-SA 4.0 (cropped)
  3. Connect the UNO R4 WiFi board to your computer with a USB cable.
  4. Open the release page for the latest version of the firmware in your web browser:
    https://github.com/arduino/uno-r4-wifi-usb-bridge/releases/latest
  5. Click the "unor4wifi-update-windows.zip" download link under the "Assets" section of the release page:
  6. Wait for the download to finish.
  7. Extract the downloaded file.
  8. Start Windows "File Explorer".
  9. Open the unor4wifi-update-windows folder that was created when you extracted the downloaded unor4wifi-update-windows.zip file at the previous step in the instructions.
  10. In the folder listing of the unor4wifi-update-windows folder, hold the Shift key while clicking the right hand button on the mouse.
  11. From the context menu, click "Open PowerShell window here".
    Windows PowerShell will now open.
  12. Type the following command at the Windows PowerShell window command prompt:
    bin\espflash write-bin -b 115200 0x0 (Get-Item .\firmware\UNOR4-WIFI-S3-*.bin).FullName
  13. Press the Enter key.
  14. The PowerShell window might now show a list of the serial ports present on your computer.
    For example:
    Start flashing firmware
[2023-07-11T06:39:09Z INFO ] Detected 2 serial ports
[2023-07-11T06:39:09Z INFO ] Ports which match a known common dev board are highlighted
[2023-07-11T06:39:09Z INFO ] Please select a port
❯ COM1
  COM42- USB Serial Device (COM42)
    If so, use the ↓ key on your keyboard to select the port of the UNO R4 WiFi board from the list, and then press the Enter key.
  15. The terminal window will now show the following prompt:
    ? Remember this serial port for future use? (y/n) ›
    Press the N key on your keyboard.
  16. The flashing process should now start. Wait for it to finish, as indicated by output that looks something like this:
    Chip type:         esp32s3 (revision v0.1)
Crystal frequency: 40MHz
Flash size:        8MB
Features:          WiFi, BLE
MAC address:       dc:54:75:c4:c6:54
[00:00:15] [========================================]      826/826     0x0
  17. Disconnect the USB cable of the UNO R4 WiFi board from your computer.
    :exclamation: It is essential to perform this step.
  18. Disconnect the jumper wire you added at step (2) of the instructions.
  19. Connect the UNO R4 WiFi board to your computer with the USB cable again.

The board should now be recognized correctly in Arduino IDE once again.

Please let me know if you have any questions or problems while following those instructions.

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