I've given up on Unichip and replaced my original screen with an Android 9 screen where I can run Waze/Google maps/Spotify natively. No more CarPlay. I got fed up with the random disconnects which gradually started happening on the Unichip and I was unable to resolve.
Unichip support seem to have given up on this product and kept directing me to their wireless model, telling me it's much better.
Anyhow, I'm selling my Unichip on Ebay if anyone wants one to disassemble or play with - just don't expect reliability!
https://www.ebay.co.uk/itm/333385372837