In order to be able to use USB sticks with the HU 650 I ordered a Grom adapter from the company Car-tec-tronix and installed it immediately. (Connection to the 8-pin socket for CD changers) They assured me there that it should work uncomplicated…but: the HU does not offer me a CD changer. Does anyone know the problem? Can the friendly change this by software release and if yes, what costs such a thing??? Achso: V70, Bj 1/2007, HU 650 Thank you already in advance Cu Sasch