Question: how to reset gmg wifi?
Answer: Unplug the Grill.
Hold the "FOOD" button down, Then plug the grill back in, while continuing to hold "FOOD" button for about 15 seconds.
The LCD Panel will begin to count up from 1 to 999, Release the "Food" button. ... 
Unplug your Grill and plug it back in to complete the board reset.