Audi Navi Plus AUZ1Z1W lost Code..please help me

Hi guys

I buy a Audi Car with a NAVI PLUS Radio but the seller has not a
Code of this Radio…
I`m not a Elektrical Spezialist or a Mechanic guy…please Help me

AUZ1Z1W3133964 <i can read on the Radio…..

I hope thats enough….
I Hope anybody can help me…
I Think so

best Regards…
Thanks alot