I bet he has an rx14 in his tank guys. The a b c switch on the side makes me think its the old system.
they had faulty boards.

Sometimes the turret turing inside can pull wires loose. Check for that, just reseat all the plugs.

your dealer name was blurred out by the board admin. You are going to have to go right to them to see if they can help you. But if you get a different tank, try to get a 2.4ghz new model.