For the nuvi 2505 series devices
The unit should now speak in the voice you have selected.
To perform a master reset on a nuvi 2505 series device:
Note: A master reset will erase all favorites and will restore your device to the default factory settings. If you would like to back up your favorites you can find instructions to do so here.
The device will now be reset. Follow the on-screen prompts then place the device in an area with a clear view of the sky until it acquires satellites. This can take up to 15 minutes.