On the armrest display, turn the selector knob to the 1 O'Clock position (hash marks), then press Enter and the Right Arrow key at the same time. A bunch of info will come up. One line will be about the translator and if so equipped will have the hardware version # and the software version. If you intend to use a Trimble NavII, the version must be 283-3405-00 or later. If it needs updating CAT needs to use their ET tool to flash it.