In Home Assistant, navigate to Settings > System > Backups. Configure the backup settings and create a manual backup.
On your new Proxmox server, you can download the qcow2 file from Home Assistant's website and run it as a virtual machine.
On first boot, you can import your previous configuration from a backup.
Hi Feddinat0r,
Enable developer settings and explore the audio settings in there, there might be a way to get that done, or it might only be limited to Bluetooth.
Also, this app isn't quite designed for this issue but maybe take a look into BTCarMono Mono BT Router. I used it in the past until I fixed the issue I had with a Bluetooth device. Also, I'm not sure it's compatible with your phone running such an old version of Android, you'd have to test.
Good luck!