I got 2015/06 CLA 250 with Audio20 (522) NTG5*1 head unit with SD card navigation and a single CD. I've taken a picture of my head unit sticker with build numbers.
Before I start my journey by:
Purchasing A1728202000 USB retrofit part
Doing software update
Buying Chinese activator...
I finally installed the JoyeAuto CarPlay + Android Auto Unit. I gotta say it was a massive pain to install cause it required the removal of:
1. Air Vents
2. Glove Box
3. Command Console (and the pain of putting it back with all those extra wires)
4. AC/Cup holder pieces (yes both of them)