Web Reference: Oct 31, 2025 · If so, the problem should be fixed by reducing the upload speed, which is configurable via a convenient menu. Select Tools > Upload Speed > 115200 from the Arduino IDE menus and then try uploading the sketch again, just as you did before. Hopefully this time the upload will be successful. To be able to upload the sketch via the serial interface, the ESP32 must be in the download mode. The download mode allows you to upload the sketch over the serial port, and to get into it, you need to keep the GPIO0 in LOW while resetting (EN pin) the cycle. In this ESP32 troubleshooting video, we'll guide you through common problems that arise during code uploads to LOLIN D32 and D32 PRO boards.
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