How to Fix Arduino Nano ESP32 Upload Issues

Are you struggling to upload code to your Arduino Nano ESP32? You’re not alone! Many users experience frustrating errors such as:

Failed uploading
Uploading error, exit status 74
Cannot open DFU device found on devnum3
No DFU-capable USB device available

If you’ve already tried common troubleshooting steps like double-tapping the reset button and still can’t get it to work, don’t worry—we’ve got some solutions for you!

Step 1: Check Your Board Manager

Start by opening your Arduino Board Manager and filtering for Arduino Nano ESP32. You should see an option for Arduino ESP32 boards.

If it is not already installed, click Install.
During installation, you may be prompted to install drivers—click Yes to proceed.
You might be asked to install additional drivers as well—again, click Yes.

Step 2: Select the Correct Board and Port

Once the Arduino ESP32 boards package is installed, navigate to Select Other Board and Port. Even if you previously had it selected, follow these steps:

Select Arduino ESP32 boards from the list.
Choose the appropriate COM port.
- Avoid selecting a port that ends with DFU.
- Pick the COM port associated with your board.

Step 3: Upload Your Code

Now, try uploading your code again. If all steps were followed correctly, your code should now successfully upload to the board.

Still Stuck?

If you’re still encountering issues, drop a comment or seek help from the Arduino community. Troubleshooting can be frustrating, but persistence pays off!

What’s Next?

If you’re new to Arduino and want to improve your programming skills, check out our next tutorial on Arduino IDE, functions, variables, and more. This will help you get up to speed and make the most out of your Arduino projects!

Happy coding!