AVRdude
https://nodemcu.readthedocs.io/en/latest/en/flash/
esptool.py --port <serial-port-of-ESP8266> write_flash -fm <mode> 0x00000 <nodemcu-firmware>.bin
https://nodemcu.readthedocs.io/en/latest/en/flash/
esptool.py --port <serial-port-of-ESP8266> write_flash -fm <mode> 0x00000 <nodemcu-firmware>.bin