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 info@homehome.app, write your device ID, after activation restart your device.