Just bung a new head unit in :laugh:. And welcome (Y). Pics of the car? :grinning:
Some excellent adviceA couple of options, if you have the service history and can find the suppliying dealer they may have the code recorded, you can take it to a dealer who from the serial number will apply to nissan for the code, but they do charge or as said above just fit a new unit.
Some excellent advice
Alternatively