Try a different USB port or a powered USB hub. Some adapters require more power than a standard keyboard USB port provides.
Look for "Bluetooth Radio" or "CSR8510 A10" (a common identifier for these adapters). If it appears here, your Mac sees the hardware. Using "BlueHDP" or Third-Party Tools Hk-808 Bluetooth Usb Adapter Driver For Mac
Since there is rarely a "setup.exe" or ".pkg" installer for these generic adapters on Mac, follow these steps to force macOS to use the HK-808. Disable Internal Bluetooth Try a different USB port or a powered USB hub
USB 3.0 ports can sometimes cause interference with 2.4GHz Bluetooth signals. Use a short USB extension cable to move the HK-808 away from the computer's body. If it appears here, your Mac sees the hardware
If the device is recognized but not functional, some users of older macOS versions (Mojave or earlier) use tools like or specific Broadcom/Realtek patches found on GitHub. However, for 10.15 Catalina and newer, these are rarely required and can sometimes compromise system security. Troubleshooting Common Issues