Put your ESP firmware for flashing e.g. inside this dir

ESP32 firmware is available from the Espressif site:
https://docs.espressif.com/projects/esp-at/en/latest/esp32/AT_Binary_Lists/ESP32_AT_binaries.html

ESP32 micropython firmware:
https://micropython.org/download/esp32/

Infos about flashing etc:
https://docs.espressif.com/projects/esp-at/en/latest/esp32/Get_Started/Downloading_guide.html
