Controller - Radio Communication

We got a couple of class super kits sets, but am having a problem setting up the controller via radio communications. The current firmware for the brain was installed and I believe for the controller also. The controller works when it is tethered, but the immediate problem is that the brain at no time appears to be searching for a signal - nothing on the display where the bars should be. The 900 MHz radio is installed on both the controlled and the brain.

​I looked over all the forums, but no luck so far in getting this to work.

​Update: Problem figured out. The radio was not entirely in the slot. It required a lot (really a lot) of pressure to get it to snap in.