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====== asus usb-bt500 ======

  - download rtl8761b* from https://github.com/aczutro/android_hardware_realtek/tree/rtk1619/bt/rtkbt/Firmware/BT
  - move to /lib/firmware/rtl_bt/
  - ln -s … rtl8761bu_config.bin
  - ln -s … rtl8761bu_fw.bin