Corebook X Sound control by keyboard issues

Since I bought Corebook X on March 2022, I have issue that can not control sound by keyboard function. There are nothing when press sound function keys (Mute, Vol.UP, Vol.DN)…
I would like to solve it, if possible…

Hello, have you clicked after adding FN?

(post deleted by author)

Yes, I have clicked the F2, F3 or F4 key after adding FN, but nothing change…

Hello,

Just to confirm, you are clicking F2 F3 F4 while holding down Fn button, right?

Yes, I am clicking F2 F3 F4 while holding down Fn button.
2022年10月16日 9:20 +0100、CHUWI | Official Forum incoming+afc3e94808215584d53ba700159609bd@chuwi.discoursemail.comのメール: