Update:

Help!

After a lot of research, I ended up going for an Xtrons model, which the very kind and helpful customer service assured would work with my model with a separate cable. It arrived about 2 weeks ago, but I haven't had time to look into it until today. I decided to follow the installation of Crowz, which was very helpful, but upon connecting every cable as is indicated, the stereo does not turn on. Nothing, not even a blink.

I tried to troubleshoot every connection, but could not come up with anything. Any ideas or suggestions or similar experiences?

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03.06 BMW X5 4.8is LeMans Blue