Change the APPEND line in /flash/extlinux/extlinux.conf from
APPEND boot=UUID=<uuid> disk=UUID=<uuid> quiet console=tty0
APPEND boot=UUID=<uuid> disk=UUID=<uuid> quiet console=tty0 bluetooth
It should make bluetooth work on MVR9 (makes my MVR9 box freeze when I try to reboot, I need to pull power to restart)
Please also verify if CEC still works, it does not seem to work on my MVR9 box, I suspect cable or bad HDMI connector.
I got bluetooth to connect now.
But when connecting to bluetooth to my phone and having audio routing enabled for the LibreELEC BT connection on the phone, when I play any video in LE, it would crash after a few seconds.
Disabling bluetooth, then videos play fine again.
Not sure if it's also a problem with bluetooth speakers or other devices.
I can also provide logs if it's not reproducible.
Hope it can be solved.
Was ttyS0 also changed to ttyS2?