nodemcu-firmware/docs/en/flash.md

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Below you'll find all necessary information to flash a NodeMCU firmware binary to ESP32. Note that this is a reference documentation and not a tutorial with fancy screen shots. Turn to your favorite search engine for those.
!!! attention
Keep in mind that the ESP32 needs to be [put into flash mode](#putting-device-into-flash-mode) before you can flash a new firmware!
## Tool overview
### esptool.py
> A Python-based, open source, platform independent, utility to communicate with the ROM bootloader in Espressif ESP8266.
Source: [https://github.com/espressif/esptool](https://github.com/espressif/esptool)
Supported platforms: OS X, Linux, Windows, anything that runs Python
Execute `make flash` to build and flash the firmware. See [Flashing Options](build.md#flashing-options) for the configuration of esptool.py.