Did you have a chance to test bluetooth?
Don't remember if I did at that time. But I did now. And speaker did connect to cuboxi. I selected audio device as pulseaudio and sound come from speaker.
I had to select "trust and pair" or something like that when connecting bt speaker. First I selected pair and it didn't connect. After reboot and using different option it works.
Tests were done with LibreELEC-imx6.arm-8.0.1.img.gz image.