I bought this cable and the guy told me it was made in Germany by the same BMW supplier.
http://www.ebay.com/itm/BMW-MINI-iPO...item1c2861b49a
It should support the integration so I will try to play a litle bit more with it in the car. The best would be to try it on another car and trying a working cable in my car.
Thanks again, you help me!