The Ecoer Wifi Installation Manual (Attached Below) is very simple and self explanatory.
HOWEVER,
There is one step that will step the process for failure, as it involves the timing for the Wifi Search on the APP and on the Thermostat Unit,
The video below will show exactly how to time the steps when you have gotten there in the steps.
PLEASE REMEMBER THAT OUR WIFI APP IS ONLY COMPATIBLE WITH A dedicated 2.4 GHTZ Wifi. I can not be 5.0 or a hybrid (Meaning a set where the router chooses automatically) .
Video does not fit here below is the link of it from drop box :
(HOLD Ctrl , while holding Ctrl, Click Link. This way it will open in new tab and not close this one.)