If you are willing to spend money then go for CIC + COMBOX retrofit. It is ultimate car infotainment + bluetooth system.
If budget is tight then go for aftermarket AV unit like Dension, or BMW module for AV.
650i F12 - HUD, 6WA, SLI, Logic 7, Dynamic and Adaptive Drive, Comfort Access, Soft-close, top-view,
Previous X5 40d M Sports and 535d LCI