L520 - Bluetooth problem on windows 8.1

Hello,
I have updated some months ago, my laptop 7859-5SG from Windows 7 to Windows 8 -> 8.1 and after that the bluetooth radio doesn't work anymore.
I tried to find a driver on the driver download section for my laptop, but I didn't find nothing.
First problem found, is the hotkey fn+F5 that not show nothing on the display after key press, and normaly with this function I can see if the radio is on or off.
I checked on the BIOS section if bluetooth is enable, and this is on.
What I can do to activate bluetooth radio again?
Thanks.
Regards.
Daniele
Solved!
Go to Solution.

Problem solved.
I have found the way to set BT on.
Instead Fn+F5 I have found on the section "Lenvo Internet Connection", a function that call "Radio Wireless".
Now I'm happy.

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