Dont know if you really need to do it. I just received my first socket and I am waiting for 5 more - then I will flash and try them out. I cannot tell you anything out of my own experience, but here is a thread: ITEAD Sonoff switches and sockets - cheap ESP8266 Wifi+MQTT hardware . I think it is way easier to connect it with wifi and the button has more functions then - at least I think so 
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