You can download binary file from here. A ) Get Windows standalone executable B ) Run in terminal pip3 install tasmotizer tasmotizer . py After installation start your device in flash mode. (GPIO-0 is HIGH) Flash mode for Sonoff 4CH:
Press and hold button 1 - Plug usb to your pc - Wait 3 seconds while holding the button 1 Ready for flashing.
Device will be in demo mode. Try it in demo mode and if you like it get 4 credits Send an email to firstname.lastname@example.org , write your device ID, after activation restart your device.