Here's how to perform a factory reset in the TD-07:
Caution: Performing a factory reset will erase any custom settings that you have created in the TD-07. Be sure to take note of any changes you have made so you can program them again if desired.
1. Press the [] (SETUP) button.
2. Press the right cursor button [ > ] until "FACTORY RESET" appears.
3. Press ENTER twice.