If you purchased a Cab06 and are having display issues with your 5amp PH-Pro , your command station might need a firmware upgrade. You must have firmware version 2007B or later. This version fixes compatibility issue with the Cab06. Addresses problem of showing correct engine numbers on the cabs LED display. The problem would show up if the engine number was greater than 4095. You must upgrade to this version if you use a Cab06.