What I normally do when my phone can't find the 7p6 units is use vcds to clear all the old profiles from the unit, unplug the unit and plug back in. Then do a search to pair it.
What happens when you press phone button on the rcd 510
You won't need highline dash for it. Can all be done from phone and controlled from rcd or rns.
Sent from my SM-G955F using Tapatalk