HP Envy x360 15-cn0001 BIOS advanced menu

Can someone advise on how to enable DIM keyboard back-lighting on a HP x360 15. The current settings are Off and ON, the ON is too bright for me and I would like to enable the DIM setting.

I am aware that a similar HP Specter laptop has Off, DIM and Bright settings. Is it by accessing the BIOS advanced menu? if so, how to access that menu?

My computer is Envy x360 15-cn0001ne and my current BIOS is F.24

TIA, Simple.

Bro, same model and same problem, have you found any solution yet?

Regrettably, no.