This happens because the generic chip inside the dongle (usually made by Realtek, Broadcom, or Cambridge Silicon Radio) has a specific Vendor ID (VID) and Product ID (PID) that Windows 10 doesn't recognize automatically.

Let Windows Update fetch it.

: Many older Yealink dongles use CSR (Cambridge Silicon Radio) chips. If Windows fails to find a driver, searching for "CSR Bluetooth Chipset Driver Windows 10" can often resolve the "Driver Unavailable" error. Hardware Conflict

Right-click your Bluetooth Adapter (e.g., "Bluetooth Radio" or "Generic Bluetooth Adapter") and select Update driver Search automatically for drivers 3. Reinstall the Driver

Some YetM1 drivers were designed for Windows 8.1 but work perfectly on Windows 10.