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Someone entered a PIN, and you'll have re-enter it to use the GPS again. The only people that can unlock it is the person that entered the PIN and Garmin. You'll have to contact one or the other. Be prepared to provide "proof of purchase" when talking to Garmin - as they won't unlock it "just because".
You can contact Garmin Technical Support directly, here.
I had for 2 years a nuvi 255w and its as working real good. Until one day i tried to open it up and it ask me a code pin. Witch i dont have. Ive been the only one owner on that GPS and never put any pin code on it and now just like that it want one... Grrrr that **** me off i cant use it anymore i dont have any acess anywhere exept that pin code of 4 number,. Is this possibility of update? I dont know I am the only one in that situation?
Ask the person from whom you purchased this unit (it does NOT come locked from the factory) what the PIN is. If he/she will not provide the code, ask for a refund. You will NOT be able to use this unit without the correct PIN.
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.
The only way to unlock a PIN locked unit is to enter the correct PIN number, or take the unit to the location at which the PIN was entered. Other than that, your only other option is to send the unit back to Garmin.