Yes, I installed LineageOS 14.1 which is Android 7.1.
The announcement is here: Official LineageOS is here!
And the install instructions are here: https://wiki.lineageos.org/devices/FP2/install
But maybe I’m still misunderstanding your problem, because in one of the earlier posts you wrote that you do have a wheel icon for those devices that work. The non-working device is probably the only difference between your version and mine. So installing LineageOS might not be a solution at all.
Recently I had problems connecting to the radio of a car. Sometimes it just helps to try again and again, probably in a different order of switching bluetooth on on the different devices.
From Volker’s answer I would assume your device somehow got unpaired. Which is what I think you want to achive. Then it would be clear it doesn’t work 
Just try to go through the pairing steps again.