If the firmware version is F.1.6 or less, it will never work with iPhone 6 and a few new phones
You need to buy a newer dongle. You can't upgrade the firmware on these.
As for your car, you should install it in the C pillar. Never in the trunk.
Originally Posted by HealyC
Must also check my own, does that mean it's the most recent software/dongle? Afaik my kit is about 1.5-2yrs old.