How to perform a master reset on nuvi devices. Start with the device off and unplugged from power. Press and hold the lower right hand corner of the display portion of the touchscreen. Power on your nuvi while continuing to hold the display.
Remove your finger from the touchscreen when "Erase all user data?" appears. Touch Yes. Your device will now reset. Follow the onscreen prompts and then place your device in an area with a clear view of the sky until it acquires satellites. Note: A master reset may erase all favorites and will restore your device to the default factory settings. If you would like to back up your favorites to your computer.