Add the following line: deb http://apt.osmc.tv stretch-devel main
Run the following commands to update: sudo apt-get update && sudo apt-get dist-upgrade && reboot
Your system should have have received the update.
Please see if the issue is resolved.
I also recommend you edit /etc/apt/sources.list again and remove the line that you added after updating. This will return you to the normal update channel.
after a modprobe 8250 dmesg gives me:
Serial: 8250/16550 driver, 1 ports, IRQ sharing disabled
also
/dev/serial0 → ttyAMA0
/dev/serial1 → ttyS0
are now there where they should be
only bluetooth is not in the network settings
and /usr/bin/hciattach /dev/ttyS0 bcm43xx 921600 noflow says:
Can’t get port settings: Input/output error
Can’t initialize device: Input/output error