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Re: unlocking security code
The first thing you have to do is enter the correct PIN or take the unit to the location at which the PIN was set. It will now unlock. You can then press the icon that looks like a wrench, and look for an icon that says Garmin Lock (it is in different places on the different units, and I forgot exactly where it is on the 660, sorry.) You can then change the security code from there. If you are trying to unlock the unit without the PIN number, you will be unable to do so without taking the unit to the security location. In that case, your only option is to send the unit to Garmin.
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If you can't remember your password, take it back to your security
location and it will unlock itself. You can then change the password to
something you'll remember. If it won't unlock at the security location, send it to Garmin with the original receipt and they'll reset it.
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.
If you are the legitimate owner, you can send your unit back to Garmin to be unlocked. Be prepared to provide rock-solid proof of ownership because Garmin has a program that prevents stolen units from ever working again. It's one of the reasons that I purchased it. As word gets out that you cannot unlock a stolen unit, thieves will be deterred from stealing them in the first place. And if you try to open the unit to see if there is any easy jumper or something, you will permanently destroy it.
You can't. Do you not remember your security location? As long as you take the unit back to this location, it will unlock. Otherwise, you'll have to send it in to Garmin with your original receipt to get it unlocked.