Blaupunkt Car300 code needed?

Hello. I bought a car recently from an old man who never used his car radio. So when I tried to use it, so it needed the security code. Display now reads only SAFE. Does someone have possibility to generate the code for this radio. Its Blaupunkt CAR 300 (D) No. 90 532 620, serial number GM0300V6169855. Thank you for your help.