TomTom GO EN - Manual (Page 49)

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Reset factory settings
This button may only be available if all menu options are shown. To show all
menu options, tap Show ALL menu options in the Preferences menu.
Reset factory
settings
Tap this button to restore the factory settings to your TomTom GO.
All your settings, including Favorites, your Home location, warnings for
POIs and any Itineraries you have created are deleted.