I have gone to a local coding Guru and I now have full screen apple car play.
It required a firmware upgrade as my then current firmware was not capable of upgrading without the firmware upgrade. I did mention that I was planning on doing it myself but although it would be possible you have to be very careful about maintaining the correct voltage throughout the entire upgrading processas as there is potential to brick the HU if you dont. My guy used a battery charging style machine that was plugged into the mains and maintaned a constant 14.1v during the upgrade process (approx 90mins). Attached pics show before and after versions.
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