Yes, you will need to run the cable from the new android system to the back where all the connections to the BM54 are. Plan on a solid day routing the wiring, there is some great information here on the forum and a solid video to watch is
https://youtu.be/D1gV5QHJRs8
And a good thread to read
https://xoutpost.com/bmw-sav-forums/...ideo-link.html