help unlock garmin nuvi 255w

hi i have garmin nuvi 255w with 4digit pin. Please how to unlock this model?

What do you man by unlock?
A) unlock to install other than Garmin navigation ==> impossible
B) unlock by removing the pincode? You can contact Garmin if you are the owner. Know that every legal owner should know the way to unlock the device. We give no support nor advice how to bypass the pincode.
There is no reason at all to "hack" your device when it's yours! Only previously stolen devices would need that sort of cure. And that is illegal even criminal !!!