Why don't you use a 4 pole jackplug and socket? The Sonoff TH also uses this connection. It is a much cleaner solution.

I have a similar problem with the Sonoff SV ver. 1.0 When I flash some recent ESP8266 Mega builds on it, the Sonoff SV doesn't seem to boot and the AP doesn't show up. Before I flash the firmware, I flash it with a blank firmware. Esp Easy build 120 doesn't work either. Strangely the Esp Easy build ...

In Germany en the Netherlands, and maybe some other EU countries it is common to use frames around the frontplates for the wall sockets. I think you would have a huge market alone in these countries if you could make the front glasplate fit inside a few of the commonly most used brand/type frames. S...