Hopefully you have not yet done a clean boot.
I have a Lenovo ideapad s340 , as you know the f key by default do what it shows on the symbols , example pressing f11 and f12 will make the brightness go up/down. to make the f keys work as normal you have to press fn and the f key , example fn + 12 whilst on internet will show the developer data. This to me seems wrong as I would have thought to make our special keys work we would have had to do fn + an fn key , not the other way round.
Use the lenovo vantage program to update everything.
I see mike is f4 and camera is f8 , do they work for normal f key function
This is your manual if you have not downloaded it,
https://www.manualslib.com/manual/1172293/Lenovo-Ideapad-310.html
This is what normal f key functions should do.
https://www.computerhope.com/issues/ch000306.htm
Post back if it helps you please.