To restore or to enable Bluetooth you will need to install the corresponding drivers for your product. Please visit the official website and manually search for your laptop model using the drop-down menus. You will need the Short Model No which is found on the back of your laptop (the sticker with the serial number of the laptop) then select the corresponding operating system you are using and from the list that appears select Bluetooth and download the drivers.
Install the setup package and restart your laptop if it's necessary or requested.