Those "extra" wires sounds like someone had something else in there before and they are a legacy. - my wiring was "clean" - i.e. no taped up or "new" wires and nothing like lgt.1
I didn't need to run any new wires for mine permanent live is in the quadlock, switched (acc live) comes from the canbus adapter as does "illumination" - i.e. "your lights are on" - when you turn you lights on do the buttons on the headunit light up and does carplay switch to night mode.?
The aerial has an amplifier ( actually 2 amplifiers - they live in the a pillars both sides) - sounds like possibly that's not "happening" for you - the aerial connector on mine had a "fakra" and a lose blue wire - I was expecting to have to do something with that but I didn't need to - fm works fine for me - if someone has been in there previously then something may have happened to the "default" wiring - hard to guess to be honest - can only go by my experience which was - I didn't need to mess with anything for fm to work
i do the same for the hotspot - but again, mine does have internet connection - and I have been able to update the built in apps (the carlink2 app that is carplay - and some of the canbus components - I have also purchased tomtom go for android and installed that on the headunit itself as a fall back for "for whatever reason I dont have a phone right now" contingency.
I have an app called radioplayer - basically picks up all the internet broadcasts for stations - that's carplay compatible and works well for me - hence I haven't bothered with DAB .
