thought I would come back on this to close the thread out
You need to amend the long coding to enable USB/Iphone UI4 functionality.
Taken from mr fix video
https://www.youtube.com/watch?v=JH6wFeh8SmQ
Module: 5F → Coding → Long Coding → Byte: 19 → Bit: 6 → enable
Module: 5F → Coding → Long Coding → Byte: 19 → Bit: 7 → enable
Module: 5F → Adaptation → Channel: Interface for external media activation - connection 1 → activated
Apple car play USB part number for a polo is is 6C0035249B
There are an additional two pins for the USB to work which go from:
Pin 3 Green qudlock > USB Green Fakra pin 6
Pin 4 Green quadlock > USB Green Fakra pin 7
Of course you need to have apple car play activated via a swap code release either at the dealer or I had mine done by Bart at VAG Retrofits Coventry

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