I suspect that system files got corrupted, So I did an sfc /scannow. But it gives an error as 'Windows cannot start this device because its configuration information (in the registry is incomplete or damaged. Broadcom BCM20702 Bluetooth 4.0 USB Device). I tried to 'update driver software' and select the driver manually in device manager. But now it is showing as 'BCM20702A0 unknown device' in device manager. For each one, click Uninstall, then in the next window select the box that says Delete the driver software for this device if it is available. Here are the steps to do so: Step 1: Hit the Windows logo and I keys at a time to trigger the Windows Settings. So I tried with the installation cd of this dongle & installed it succesfully. Right-click on each device under the Bluetooth section, saving Broadcom BCM20702 Bluetooth 4.0 USB Device (the Plugable adapter) for last. Solution 1: Run Bluetooth Troubleshooter If you are getting an error message saying Broadcom BCM20702A0 driver is unavailable Windows 10, then you should run the Bluetooth troubleshooter. But now, surprisingly, this new dongle isn't working as well! The support page of this dongle ( here) states that in windows 10, no additional driver installation is neede & it will be installed automatically.
I brought a new Kinivo BTD-400 Bluetooth 4.0 USB dongle having Broadcom BCM20702 chipset (its compatible with win10) cuz my old built-in dell wireless 365 broadcom bluetooth wasn't working with windows 10 (but was working with win7 & 8). I have Windows 10 (build 10240) in my Dell Inspiron 1440 laptop.
