https://github.com/mirko/SonOTA/wiki#getting-the-itead--ssid
ZitatGetting the ITEAD-###### SSID
On various devices it appears that a 2nd 7 second button press is required sometimes to put the Sonoff into Configuration mode so it will broadcast the ITEAD-###### SSID. If after pressing the button for 7 seconds you have a pattern such as blink-blink-blink-pause-blink-blink-blink-pause, press the button again for another 7 seconds until you have a steady blink-blink-blink...
Aus dem Wiki