I suspect that system files got corrupted, So I did an sfc /scannow. This issue will prevent specific Bluetooth components from communicating with your operating system properly, but don’t worry. But it gives an error as "Windows cannot start this device because its configuration information (in the registry is incomplete or damaged. 1 If you encountered the BCM20702A0 driver is unavailable error, which indicates there are no compatible drivers or the drivers for this device are not installed, you’re not alone. Broadcom BCM20702 Bluetooth 4.0 USB Device). I tried to "update driver software" and select the driver manually in device manager. Right click on the hardware device you wish to update and choose Update. But now it is showing as "BCM20702A0 unknown device" in device manager. Go to Device Manager (right click on My Computer, choose Manage and then find Device Manager in the left panel) 2. So I tried with the installation cd of this dongle & installed it succesfully. 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.
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