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If you have a Garmin Lock on your
nuvi, zumo or StreetPilot c500 series and you have forgotten your 4 digit PIN
number you can unlock the device by returning to your Security Location. The
Security Location is the location that you set when you first enabled the
Garmin Lock on your device. Returning to the Security Location will unlock your
device. (Approximately 150 feet from that location)
If you have forgotten your PIN and Security Location please contact Product
Support for assistance. Please note Garmin will require a copy of the receipt
and there will be a charge to unlock the device as this issue is not covered by
Unless you already made a backup copy, which you can restore back to the Garmin. The only solution is to buy a copy of Mapsource and register it with Garmin. Garmin will supply a unlock code based on the map registration number and the unit serial number.