我尝试让我的 USB 蓝牙适配器工作，但它确实说没有固件
lsusb 输出：
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 0bda:8771 Realtek Semiconductor Corp. Bluetooth Radio
Bus 001 Device 004: ID 413c:2113 Dell Computer Corp. KB216 Wired Keyboard
Bus 001 Device 003: ID 413c:301a Dell Computer Corp. Dell MS116 Optical Mouse
Bus 001 Device 007: ID 2717:ff80 Xiaomi Inc. Mi/Redmi series (RNDIS)
Bus 001 Device 002: ID 0bda:8172 Realtek Semiconductor Corp. RTL8191SU 802.11n WLAN Adapter
Bus 001 Device 001: …