Hi @ierturk,
TorizonCore requires a read-only root filesystem for the OSTree and OTA features. The best way to make this modification is to create an override for the systemd bluetooth service. You can run the following to create the override:
$ EDITOR=nano sudo systemctl edit bluetooth
That will open the nano editor in the proper file. Then you enter the following contents:
[Service]
ExecStart=
ExecStart=/usr/libexec/bluetooth/bluetoothd --compat
This ultimately creates the file /etc/systemd/system/bluetooth.service.d/override.conf with the above contents. The first empty ExecStart= is required since that is an additive field and you need to clear out the existing contents before adding new.
Drew