Assuming you are referring to the Lenovo Legion Go (which uses the "x8j6l" mainboard identifier), "better" usually means fixing stuttering issues, gaining access to custom Fan Curves, and unlocking the full 30W TDP for handheld gaming.
If your computer is currently working perfectly and you don't have a specific issue to fix, often notes that an update may not be strictly necessary Are you experiencing a specific issue x8j6l bios better
Install:
like battery drain or slow boot times that makes you want to update? Assuming you are referring to the Lenovo Legion