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If all connections are correct and you have put the Sonoff board in flashing mode, you will it being flashed.
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Press and hold Sonoff’s button as you connect the serial programmer board to the USB of your computer.Any higher voltage may fatally damage the Sonoff. This is very important: Some serial programming adapters will have both 5V and 3.5V at Vcc, make sure that you connect ONLY 3.5 Vcc.What is transmitted by Tx in FT232RL should be Received by Sonoff and vice versa. Ensure that that the Tx and Rx are reversed. Make connections to FT232RL as follows: Vcc Vcc, Tx Rx, Rx Tx, and GND GND. Open your Sonoff device and locate the Vcc, Rx, Tx, and GND terminals.Move this file in the same folder as espeasy.exe (unless you need other capabilities/language interfaces) Download only sonff.bin This is good for most cases. Download the most recent release Tasmota firmware.So, download the latest verison of Espeasy The current version is ESPEasy_mega-20190216.zip Unzip in a folder. I use FT232RL based USB to Serial programmer adapter. Update: See simplified Web UI configurationĪ serial programmer board. If you are interested only in flashing a custom firmware and connect to Home Assistant or simpler, there is an easier and faster way to do that. However these are slow and tedious methods (unless you want to edit several parts of the source code and recompile). These include using Arduino IDE or PlatformIO. There are several ways to flash a firmware to an ESP8266 based Sonoff devices. Tosmota is a open source firmware that converts a black box Sonoff device to secure and extend its capabilities.