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if you forgot your pin number you must return to the SECURITY LOCATION...... the security location is where you first set up your gps....( your home or office ) then the unit will automatically unlock for you, remember to reset your pin number when unlocked..
Other than that you would have to send your unit back to Garmin with the proper receipt of ownership.
You have Garmin Lock activated on your nuvi: there are only two ways you can unlock it.
1. Enter the PIN code (but you clearly don't have it or you wouldn't be reading this).
Take the unit to the Security Location you chose when activating Garmin
Lock: it will then unlock without the PIN code and you can then either
reset the PIN or disable Garmin Lock. The Security Location should not
be the owner's home address, but many owners ignore this recommendation.
Many owners choose their workplace or a close friend or relatives
address for this purpose.
If neither option works then your unit
is useless unless you send it to Garmin with proof of purchase. Garmin
charge for the service and if your maps are not up to date then it's
really a waste of money as the investment would be better spent on a new
unit with current mapping.
I hope that you manage to either fix
your problem using my advice or at least can decide whether to abandon
the unit and buy another.
Your safe location is where you entered the PIN number (probably your driveway). If it still won't unlock, send it to Garmin with your original receipt from an authorized Garmin dealer and they will reset it for you. There is no master unlock for the Garmin units, it must be reset by Garmin.
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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
Unfortunately, even if you perform master reset on Garmin GPS unit, it does not reset Garmin Lock security feature, which password-protect most Garmin electronic devices to deter theft. If you forget the PIN or password unlock code to unlock the Garmin unit, the best solution is to bring it to Garmin to get unlocked. “Secure Location” does not unlock a locked Garmin unit either as it’s only a temporary fix as when it’s turn on outside the security location, the device is locked again."
So unfortunately, there is only one option: You have to send your nüvi into the Garmin, who can unlock it. Remember original receipt.