It is a Garmin Nuvi 310 GPS and i forgot the pin. please help me. any way to reset the pin? or crack it?

Maybe contact Garmin? They for sure have a solution for this.
There is no reason to "hack" a Garmin device.
Only previously stolen devices would need that sort of cure.
Every legal owner should know how and where to unlock the device.
And thus here lies a possibility of criminal background in this question.

I close this thread.