FN+Arrow Keys no longer change aura brightness of the keyboard ASUS TUF A15 FA506QM

- System: Windows 10 Home 64bits
- Battery or AC: Both
- Model: ASUS TUF A15 FA506QM
- Frequency of occurrence: Always since a few days
- Reset OS: Not yet
- Screenshot or video: In the comments section
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Detailed description: I have the same problem from this closed discussion:
Where every Hotkey works perfectly, including the FN+RIGHT/LEFT hotkey to change the aura mode, but the FN+UP/DOWN stopped working a few days. I read the discussion, and then checked my laptop, and then I saw my serial number was overwritten to a bogus one: 12345678901234567, which is also present in the BIOS menu. It seems the problem was triggered when Windows, via its Update service, updated the firmware/BIOS, which triggered the Hotkey problem. I tried many ways to fix the problem, but I couldn't solved that by myself. I need help, please.
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Couldn´t clip the screenshot of the bogus serial number in the topic, so I posted here in the comments:
Hi there,
Please check your PM.
Thank you.