Try this
Fn + F4 = makes the keyboard brighter
Fn + F3 = makes the keyboard dimmer
If it doesnt work goto
https://www.asus.com/support/Product-Search/?keyword=s550c
Try to navigate to your SPECIFIC (exact model and serial number) machine and download the HOTKEY related files. and the correct user Manual to find out the right hotkeys for keyboard light.function.
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