LMI screen won’t work. Says needs update

When you have the cab plugged in the LMI screens won’t work properly.  If you don’t have a cab hooked up the screen in the electrical panel at base of crane will work just fine. If you have the cab plugged in the screen at the base of the crane will say needs up date.   For the one in the cab to work correctly you need to unplug the the one at the base of the crane. The plug to unplug it is behind the screen.