Mark M.

That's pretty much exactly what I put in my Q5, carplay unit and camera.
https://www.aliexpress.com/item/4001100606264.html?spm=a2g0o.order_list.order_list_main.172.16c018027OZuyF
https://www.aliexpress.com/item/1005007387471729.html?spm=a2g0o.order_list.order_list_main.167.16c018027OZuyF
https://www.aliexpress.com/item/1005005604388149.html?spm=a2g0o.order_list.order_list_main.152.16c018027OZuyF
But like you say, they're probably all the same with a different branding on it.
 
 
The carplay unit was really easy to intall, just unplug the cables from the screen and climate control units and plug in the new carplay harness between the car loom and the screen and climate controls. Camera was a little harder having to run the RCA cable from the boot lid but it just tucked under most of the trim.
Once all fitted it worked straight away, no calibrations or coding required. Seller did email me an up to date firmware as well.
I also fitted a front camera which would show after selecting Drive after Reversing, or by holding down the "back up" button on the centre console controls.
 
I'd still have it fitted now but I missed a touchscreen so replaced it with this - https://www.aliexpress.com/item/1005007550883275.html?spm=a2g0o.order_list.order_list_main.56.16c018027OZuyF

Sounds like you popped a fuse to me.

Could be warped/overheated discs.

I believe the part number is 8K2857409AJ