# Bluetooth 5.0
sudo dmesg
wget https://raw.githubusercontent.com/Realtek-OpenSource/android_hardware_realtek/rtk1395/bt/rtkbt/Firmware/BT/rtl8761b_config
wget https://raw.githubusercontent.com/Realtek-OpenSource/android_hardware_realtek/rtk1395/bt/rtkbt/Firmware/BT/rtl8761b_fw
sudo cp rtl8761b_fw /usr/lib/firmware/rtl_bt/rtl8761b_fw.bin
sudo cp rtl8761b_config /usr/lib/firmware/rtl_bt/rtl8761b_config.bin
# unplug your device
# then
sudo dmesg