Just for info: I don't know if you remember that I had the problem that the boot was really, really slow (about 4-5 minutes!). So, yesterday I updated the SMBIOS with a new serial etc. because here someone told me that but I forgot it and now the boot is ultra fast (just few seconds).
HDMI audio enabling that kexts AND setting the device-id=709D0000 (otherwise it works over DP without this).
iGPU HDMI works using the old lines.
Internet works well now, I think it was somehow just a coincidence.
On the front USB-C I had the iPad Pro connected but maybe I'm wrong and I'm not correctly remember it because I also used a normal USB-A to USB-C cable. I then use a USB-A cable for the iPhone (which you see in the screenshot).
Anyway, the Audio USB-C Adapter of the iPad doesn't work with the...
As always, thank you very much for the effort!
Question: Is there a way to make the iPad USB-C Audio Adapter to work? I tried both USB-C ports (front and rear) and the adapter is not recognized at all.