This method is complicated, please consider our latest method: Restore Factory Firmware For 1U
OLD WAY
1U using the ESP32-S2 has always been a challenge to get going using the online tool:
- The latest version of the ESP Web Tool has broken this feature, while some of the modified versions do, but still don't have the ability to enter burn mode in USB-CDC mode.
Through some investigation we found that the Adafruit ESPTool has full web port burning capabilities, and we have fixed a usable version using the source code and placed it at:
Below is a demonstration of restoring factory firmware to a working 1U without opening the shell: