Updating ESP32 firmware from another ESP32 over USB, similar to how esptool.py works

Question

Is there a way to update the firmware on one ESP32 from another ESP32 over USB, similar to how firmware can be updated using esptool.py?

This would essentially be like a port of whatever magic esptool.py uses over USB to update an ESP32, but instead of running through Python it would be an Arduino C++ sketch and would read the firmware to write to the other ESP32 from SPIFFS.

Answer 1

You can use the SD card to update the firmware. Here is the example code

Answer 2

Espressif has an official library. Here's the link:

https://github.com/espressif/esp-serial-flasher

Personally, I recommend this GitHub repository named "FlashBox - Esp32 serial flasher" by Machiel80. Here's the link:

https://github.com/Machiel80/esp32-serial-flasher

it has good documentation and even a video on YouTube explaining how it's done.

Finally, the flipperZero project also has a serial flasher project on Github, the "flipperzero-esp-flasher". Here's the link:

https://github.com/0xchocolate/flipperzero-esp-flasher