When you perform a factory reset, the Passport will power up and show the software version, then go through the normal start-up sequence. This will, of course, override any programming you have made. While the Passport is turned OFF, hold the City, Dim and Mute buttons simultaneously while turning your Passport ON. Release buttons as soon as it starts to power up and read the display for the software version. I hope that helps, and thanks for your interest in Escort!