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We have purchased two units of ThinkPad T420 (4236-CJ4). The bluetooth is not working. I have tried different drivers but same issue. It just did nothing when I press Fn+F5.


What can I do to get this functioning?


  • Press Fn + F5 to enable Bluetooth. If there is no response please install the Hotkey Features Integration found in Lenovo support site-->
  • Once it is installed ensure the WLAN master switch is on
  • Restart the system
  • Press  Fn + F5 to enable wifi  & Bluetooth

You should be able to use Bluetooth now.

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Make sure the bluetooth module is not disabled in the BIOS, under Security/I-O Port Access


just install advanced system care and make windows vulnaberality fix