Did you set 10BS/10BP to pairing mode as below?
1. If no, please press and hold the power button for several seconds until LED indicator flashes blue and red; try to search "Avantree 10B" on your bluetooth list and connect it.
2. If yes but still can't connect, please follow the below steps:
A. Unpair(for Android phone)/forget(for Iphone) unwanted bluetooth items in your phone Bluetooth list and turn off the bluetooth.
B. Reset your carkit and reboot.
C. Turn on Phone Bluetooth again and refresh/search for devices. Found "Avantree 10B" and connect.
If still failed, please kindly contact firstname.lastname@example.org for further assistant. Thank you.