So first of all, I'm only new so if I say something stupid forgive me 
My first Merc E-Class 2010 W212 CDI sport.
It has a audio 20 in it with what I can only guess is a NTG 4.0. It has Bluetooth for the phone but not for music so looking to upgrade. I have seen big screens that can introduce android.
Basically what I'm wondering is, is it actually as simple as changing the screen to get an android system? Also seen COMAND units cheap(er) but do I have to change the screen to suit the COMAND and visa versa too?
Any advice would be great so I don't waste my money
thanks in advance 
Mark.

My first Merc E-Class 2010 W212 CDI sport.
It has a audio 20 in it with what I can only guess is a NTG 4.0. It has Bluetooth for the phone but not for music so looking to upgrade. I have seen big screens that can introduce android.
Basically what I'm wondering is, is it actually as simple as changing the screen to get an android system? Also seen COMAND units cheap(er) but do I have to change the screen to suit the COMAND and visa versa too?
Any advice would be great so I don't waste my money


Mark.