- flash do not support DFU
get-started
https://docs.espressif.com/projects/esp-idf/en/latest/esp32c2/get-started/establish-serial-connection.html
The default console baud rate on ESP32-C2 is 115200 when a 40 MHz XTAL is used, or 74880 when a 26 MHz XTAL is used.
https://www.espressif.com/sites/default/files/documentation/esp8684_datasheet_en.pdf
https://www.espressif.com/sites/default/files/documentation/esp8684_technical_reference_manual_en.pdf