If there are issues with getting Bluetooth started, try running the following script:
#!/bin/sh
killall rtk_hciattach
echo 0 > /sys/class/rfkill/rfkill0/state
sleep 2
echo 1 > /sys/class/rfkill/rfkill0/state
sleep 2
modprobe hci_uart
rtk_hciattach -n -s 115200 /dev/ttyS9 rtk_h5 &
sleep 5
hciconfig hci0 up