Unlocking security code

To unlock your unit you must go with-in 50 meters of your SECURITY LOCATION , that is the place you first setup your GPS, it could of been your home or office.

Once there the unit will automatically unlock, reset your pin number at that time in the Security menu.

If you cant get to the Security location you must send your unit back to Garmin with the proper receipts of ownership.

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.

There should be a small pinhole for a reset button. Press and hold this reset button for 60 seconds. Then turn the device back on.

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 hold the reset button down for 2 hours 30 mins the garmin's entire system resets and you start from scratch

Sorry but that is a security feature. There is a chance you've purchased a stolen unit from ebay. Unfortunately, only Garmin can unlock it and they will require a receipt from a Garmin dealer.

Take the GPS unit to your secure location, and once there, you can change the PIN number.

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.

I have de solution:
*pick a torx 3 tool
*release de equipment
*put on 22 awg copper cable in the main chip on upper right pin and touch softly the + pole of a 3V batery.
tested in a garmin nuvi 780