CODE EXAMPLE FOR SHELL

bluetooth turned off even if switched on

# 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