My Bluetooth Hands-free is not connecting with win-10 PC through Bluetooth Dongle, it requires PIN but Hands-free don't have one?
If entering 0000 as PIN did not work, try the old classical interface for pairing:
Right-click the traybar Bluetooth Devices notification area icon and choose Join a Personal Area Network. An Explorer interface will open to Control Panel\Hardware and Sound\Devices and Printers.
Click Add a Bluetooth device
- Press the pairing button on the device
- When asked for PIN, leave blank and continue to connect.
Leaving the PIN blank does not work through the Windows 10 Settings applet, so for devices that don't have a pin one must use the older Control Panel interface.