This looks really good I have the same problem with my trim so going to have a go at doing the same keep up your mokka video's there really helpful 👍🇬🇧
Don't know for sure, do you have all the cables in place? Does the mid console work? If you open the door do you get an image of that on screen? If not, not all cables are installed
Watch my other video's if you want to see how I take it apart. The connection is made with an USB into the usb from the android radio. And you're right I don't understand much, but at least I make a video about it 👍