On a touchscreen GPSMAP chartplotter, try to perform the following procedure:
With the Device Off, Press the Power button to turn the device on. As soon as Garmin logo appears, release the Power button. Once the Warning Screen appears, don't press the "I Agree" button, quickly press and hold the Top-Left Corner of the screen until the message "Do you really want to erase all user settings?" appears. Choose "Yes".
Note: The first time, it may not be possible to perform all these manipulations on time. You may have to make several attempts.
Pre-save your user data (waypoints, routes, Auto Guidance paths, tracks, and boundaries) to an SD card since after such a reset all this data will be erased.
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