I did not touch the reciver (the pro has a sepearte reciver)...as long as you get a transmiter that is the same chan as your reciver you should not have to do anything to the heli, or the recivers crystal. All you need to do is buy a ch 17 (or what ever chan your heli is) transmiter, turn it on, program the transmiter, and fly the heli. As long as you get the same chan as you currently have/using you don't need to do anything else, no swaping crystals etc.