This is the tips for you to unlock
follow this instruction:
Step 1
Lock the screen by touching the "Lock" button. To unlock the screen, press the "Power" button.
Step 2
Lock the device by pressing the wrench icon, then "System" and "Garmin Lock."
Step 3
Press "OK." Then enter a four-digit PIN when prompted. Select "OK."
Step 4
Drive to a security location then press the "Set" button. Now each time you turn on the Nuvi, it will ask for the PIN. Enter it when prompted or drive to your security location.
Step 5
Send the Nuvi to Garmin to get it unlocked if you forgot both the PIN and the security location.
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