The Unknown device Bluetooth error message on Windows 11/10, means Windows is unable to detect the device connected to your computer.

To reinstall the Bluetooth driver, go to your Downloads folder, or find where the download saved, and open the R140135.exe file. Open the C:\dell\drivers\R140135\3100_216 folder, and click Setup.exe.

Intel has released updated Wireless Bluetooth and Wi-Fi drivers for Windows 10 customers to address known issues causing blue screen of death (BSOD) errors and Bluetooth devices to lose connection ...

To update or reinstall your drivers in Windows 10, open the Device Manager and right-click the device you need to update.

In Device Manager, click View > Show hidden devices. Re-check if Bluetooth appears. If it appears greyed out or with a warning icon, update or reinstall the driver (see Method 4).

Microsoft says that computers with Realtek or Qualcomm Bluetooth radios might have issues discovering and connecting to Bluetooth devices after installing or updating to Windows 10 version 1903 ...