I'm on arale. With OTA8.5 I could pair, listen to music and make calls with no problem. After upgrading to OTA9 (and without unpairing/re-pairing after upgrading), I can connect to the car, and I can listen to music but if I try to make a call while connected to bluetooth, the car will after a few moments say "the call has been transferred to the phone", but when I pick up the phone to continue the call, the call is made (ie, the dialer indicates the call is ongoing and the person I called sees an incoming call from me) but there is no sound and the other end cannot hear me.
I have not tried unpairing and re-pairing. In other words, I can no longer use hands free calling after upgrading to OTA9. OTA9.1 also suffers from this issue.
I'm not sure if this is related, but after OTA9 I can connect to the car and both the phone and the car say they're connected, but then after a second or two it disconnects and then after a while 10-30 seconds, the reconnect and they stay connected. Before, once connected they would stay connected.
I'm not sure this is related to bug #1539158 or not, but I was afraid to unpair due to other MX4 users in that bug.
@Jamie: Can you follow https:/