How to find Audio 50 map version

[CowleyStJames]

Can anyone tell me how to find the map version on my W212 E class.
It's not obvious on the Audio 50 unlike my C class Comand.

 

[markjay]

Hold down these buttons together for 10 seconds:

End Call + # + 1

This opens Engineering Mode.

It should work for Audio 50 on W212.

 

[CowleyStJames]

That worked a treat, many thanks