GHL in North America do not upgrade any controllers, I assume you are reffering to GHL Direct which is owned and operated by Progressive Reef.
If the buttons are non responsive this is due to the front panel being out of lined with the PCB, please contact them on 1866 997 7333 for directions for the simply remedy.
Can you provide any recommendations for this "simple remedy". They should have included that simple remedy with the upgrade. Do they offer a web based link for such?