I want your faulty electronics
Off or out?
I assume you want to remove the unit.
You will need some Audi stereo keys to remove it.
They are flat with a finger loop at the end.
Depending on your head unit you will need 2 or 4 keys.
Insert theses in to the flat slots on the unit, angel them to the side (i think its out) and pull the unit towards you.
This is from memory for the couple i've done, so this might not be 100% but someone who has done it on your car should be along to comfirm.