Brightness FN keys not working

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Hello, yesterday i reinstalled windows 10 in my Acer Nitro 5 an515-54 laptop, and it was all working except the fn + rignt and left arrow keys. I checked in an "test your input" site, and appearently, it doesn't even register. I already tried fiddling with bios function key settings, reinstalling keyboard drivers, and even downloading other drivers.

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