Make a master reset
Note: A master reset will erase all waypoints and favorites and will restore your unit to the default factory settings. If you would like to back up your favorites you can find instructions in the link below.
Code:
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1. Start with the unit turned OFF and unplugged from power
2. Power ON the device
3. When the copyright screen appears press and hold the lower right hand corner of the touchscreen
4. Remove your finger from the touchscreen when a message appears that says Erase all user data?
5. Touch YES
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.
or
1. From the map screen, press the "Speed" field.
2. From the speedo dial, press/hold compass direction just above the speed for ~7 seconds.
3. Press "Clear all user data" at the top of the screen
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