We have been asked a couple times how to enter a safe code in the RCD 310 VW Radios, so here it is!
If you purchase a radio with no code. locate the Serial Number that starts with "VWZ" as shown in the begining. We purchase our codes from the following person;
https://www.ebay.ca/itm/125145111023?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=rMiKxxDVTAO&sssrc=2349624&ssuid=kzDG1XYjSGC&var=&widget_ver=artemis&media=COPY
keys 1-4 are used for each digit to enter code into. Last button "OK" press once code is entered and done!