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F4 key broken. How to turn back keyboard backlight on?

Level 7
Hi there. I'm using ROG G511JM laptop for about 2 years. Several months ago it was raining so bad late at night here while I was asleep. The roof got some leakage and it went straight onto my laptop's keyboard. It was my mistake for leaving it opened like that.

After that I found several keys on my keyboard not working anymore; Tab, F1 & F4.
It was okay because it didn't effect me so much, until last week I accidentally turned the back light down (Fn + F3) and couldn't turn it up back 😞

I tried with everything, Hcontrol.exe, external keyboard, on-screen keyboard, but still it didn't work. I have to use USB light to lighten up my keyboard, how sad is that.

Can you please help me? Thank you.

Status Under Review
Eh just google a Key Remapper.

You can find a good one that does key combos, so they = different keys. Like CTRL + FN + F3 = F4.

I'll try find one for you later, just can't right now. ;d

Customer Service Agent
We might suggest you to take your product to our service center for comprehensive inspection and help you to fix the problem. Sorry for the trouble.
The following is the contact information:
Also you can contact the local service center for help. The following is the contact information:
If it is customer induced damages, it might be have cost of repair.