Hello guys

I'm new here and I have some questions I was hoping anyone could help me with..
( So I have an Audi A4 2007 B7 8E 2.7 TDI s-line )
And the radio that was originally installed is this one.. (http://img4.auto24.ee/auto24/product...9/32555379.jpg)

But now, I was lucky to find a RNS-E for my car for a very good price so I installed it and everything..
And here's where the problems start..

1) The Pin-code I received is not correct. (I have contacted Audi)
How can I retrieve the Pin code?

2) Also my screen wont open and CD wont eject?
I read on the internet that you could buy a cd to "update" so your pincode becomes the last 4 digits of your serial number.
But I can't seem to open the screen, so I could put in that cd.

3) And then I tried to connect with vagcom..
But I could not connect with my radio/navigation..
Is this because it is still asking for the pin code? Or is there something with the wiring?
Because I have read that you have to change the wiring sometimes if you change radio's but I think the wiring for the RNS models are all the some, no?
(I don't have BOSE)

PS: I'm from Belgium, and the RNS-E is an EU-model.. I don't know if this is relevant.

If someone can give me more tips, I would really appreciate it..
Hate driving around with no sound at all!

Thanks guys!

Barry