X5 4.4i e53 - new to forum

[ScubyG]

I have purchased a new head unit, it is an Android Xtrons..standard ISO so though I just needed an adaptor from the Bmw connectors to fit mine, I was very wrong! Ended up purchasing a 5m iso cable and also an adaptor as the 5m cable did not use round iso pins. I emptied the boot removing various boxes with plugs in and re-routed the what I belive to be audio cable with the round pin iso connection...I think all the boxes with connectors are something to do with the stereo? The car still works without them, I have left two boxes one which is the PDC and the other the auto suspension as when I removed it I receive the auto levelling error message.

Does anyone know what the other parts are, I have one slim black box with a fat loom coming from it, on one corner there is a tab that lifts out and it appears it is a sim card??

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