Keyboard Ubookpro 12"3 backlite

Hi, can someone remind me the key combination to light up the keyboard , as i forgot it …

Try Fn+Arrow Up/Down

Thanks for the effort
,but this is the blue version ,only working for the 12"3 inch ubookpro…and like others mentioned it has NOBacklite …however on the Chuwi website for parts it is written as having backlite …
I guess they bought the leftover stock from Aliexpress .

ANYWAY it are the only ones left for this earlyest UbookPro 12"3 …(only 2 lights for on /of…and 1 light on button for caps warning