I think the problem is dsp.

Bcredliner have the same problem, as far as I remember he has another head unit ( but also a seicane)
He started out with 20 sec of sound, I think he has the ibus adapter.
He could not find a solution, so he has taken the car to some professional guys.

Take a look on crows how to, to learn more about the ibus.
For us without dsp, the ibus is not a need to make the HU to work.


BMW e53 X5 4.6is 02

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