The Fn key plus such an asterisk:
Open Lenovo Vantage, Lenovo PC Manager, or the launch bar
application.
Have you uploaded Lenovo PC Manager?
It is needed for:
Note: Selected models have an RGB keyboard. In the case of such
keyboard, the given hot key toggles the color and effect of its backlight.
Additional controls are available in the Lenovo Vantage or Lenovo application
PC Manager.
CO has Bios to backlight the keyboard.
How old is this friend of yours? 14?
First, let him read what the BIOS on the motherboard does.
Added after 4 [minutes]:
What happens when you press the Fn key and what does it say in the instructions on pages 17 and 18?
Is something going on with the backlight?
because when you start rummaging around the laptop's bios, there is still such a function in Bios:
Enable or disable Fool Proof Fn Ctrl
Step 1. Open UEFI / BIOS Setup Utility.
Step 2. Select Configuration.
Step 3. Change the Fool Proof Fn Ctrl setting to Enabled or Disabled.
Step 4. Select Exit ? Exit Saving Changes.
When enabled, the Fn key and the Ctrl key can be used interchangeably for the z key combination
with the Ctrl key. For example, you can press Ctrl + A or Fn + A to select all text in
text editing application.
But it shouldn't affect the backlight