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I'm a little confused about which unit you have, but the answer is simple enough..... If there isn't a small hole on the bottom of the GPS, then simply hold the on/off button for approximately 15 seconds -- until the unit restarts. The small "hole" that I'm referring to will be in the same vicinity as the connector that the cable plugs into. It should say reset right by it, if the reset button is there. If you do have a reset button on the bottom of the device, you'll need to use something to press the button. A paper clip straightened out a bit works perfectly.
The following lists are from Tom Tom's website. I hope this helps:
Have you gone to the tom-tom web site and downloaded the Tom Tom home? If not I would recommend that first. There are many upgrades and additions there. But I do not believe you can update the 300 without being connected to your computer via usb cable and being on the tom tom site with tom tom home downloaded.
Hope this helps