Pairing /w BT car radio failing

Andorid

Hello,
My 7a fails to connect to my BT car stereo, an Ampire CPR60 with error "cant communicate with xx:yy:foo". Ive reset all network setttings on the 7a, tried several AVRCP/MAP versions in devel options.

Actually, my old 4a (GOS too, of course) does pair just fine.

BT generally works on the 7a, it just cant pair to that BT radio.

Is there any known BT issue on the 7a?
Thanks for any hint!

Andorid

Btw, safe mode didnt help either...

Andorid

After some searching I learned, this is a known BT issue with Android 16 in Pixel devices and some Samsungs, that cause problems with BT car radio devices. It's known for a year.
Until it´s fixed I`ll try to connect with cable to Android Auto.

de0u

Andorid Thanks for the report! Is it possible to provide a few links to plausible sources?

Andorid

Solved
de0u
No, didn't save any links, I found some discussions with similar to identical symptoms.

But, I found the solution.

I connected the 7a by wire to the USB-A of the car radio, started Android Auto on the radio, aaand suddenly the phone paired via BT. Tadaaa.

This may not be a bug, this even could be a security feature, not of the radio, but of GrapheneOS. Because the wired connection must have established some kind of communication between the devices that finally allowed BT pairing. This is just a guess, but plausible.

Now the 7a is BT paired and connects just fine without Android Auto. AA was just needed once for the wired connection and BT pairing.

Thus, I just had to install Android Auto on my 7a (in my google´d 2ndary profile) and connect first with a USB-C to USB-A cable.

Hope it helps someone else.

de0u

Andorid Thanks for the report!