How to hard reset the GTX Combo

[AirforceOne]

My GTX Combo needs hard reset but not able to do it thru the TV menu as no connection is established between the set and TV.
How can i do a hard reset thru a pin that I did not find.
Thnaks

[cpr43]

Look closely in the bottom of the box thru the plastic vents for a really small switch. Unplug the box. Push the switch and plug back at the same time