The module ng_ubt was loaded with kernel, don't load it by youself.
You should check the log(/var/log/message), if the message "ERROR: Unable to setup Bluetooth stack for device ubt0" appears here, please check iwmbt-firmware is installed or not.
The method to install iwmbt-firmwares
pkg:
pkg install iwmbt-firmware
ports:
cd /usr/ports/comms/iwmbt-firmware
make install clean
You should check the log(/var/log/message), if the message "ERROR: Unable to setup Bluetooth stack for device ubt0" appears here, please check iwmbt-firmware is installed or not.
The method to install iwmbt-firmwares
pkg:
pkg install iwmbt-firmware
ports:
cd /usr/ports/comms/iwmbt-firmware
make install clean