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Install the esptool by issuing the command below.Open Command Prompt ( Start > Run > cmd) and navigate to esptool folder.All the contents of esptool should be under c:esptool. Extract the contents of esptool compressed file to C. FTDI USB To TTL 3.3V & 5.5V Serial Adapter + Cableĭownload and install Python 2.x or 3.x from.Just backup your official firmware by following the instructions below and you can restore it later if you want.
![flash esp8266 firmware flash esp8266 firmware](https://iot-playground.com/images/articles/016/23-3-2015_18-57-02.png)
After loading any custom firmware to Sonoff, you cannot go back to the official firmware but now you can!!. - Upload Official / Third Party FirmwareĬontrolling Sonoff Smart Switches without internet over Local Area Network is hot topic for Sonoff enthusiasts.-– Official Sonoff Firmware Binary Files.