Garmin provides rock-solid theft prevention through its "Garmin Lock" procedure. If you can prove beyond the shadow of a doubt that you own the unit, then you can send it back to Garmin to get it unlocked. There is nothing they can do over the phone, and if you attempt to open the unit you will permanently destroy it. So if you are the legitimate owner, give them a call and get your problem solved. If you are not, then you are the proud owner of a fancy paperweight. :)
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All you have to do it take the gps back to where you were when you entered the pin # . It will then start up and you can either change the pin or just set it to where you won't have one .
This is done so that when IDIOTS steal them , they can't do ANYTHING with them,
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.
If you forgot your PIN, all you have to do is go to the physical location where you originally set your PIN and turn the unit on (make sure antenna is up). It will not ask for a PIN and you will be then able to change the PIN to whatever you like.