If anyone founds a solution please post it here, I really cannot stay without my pc because of online work...
I've upgraded everything, including ASUS System Control Interface v3 V22.214.171.124, still nothing.
Well... you have done everything for the software part...
and the firmware 406 you mention is BIOS, not keyboard firmware.
So it would be very helpful if we can find out what has been updated or modified before the issue occurred.
But anyway, I will double check with our technical support.
Is the OS on your device from factory? or you have installed your own before?
DiskunSame here, right now I'm on 21H1, but this problem appeared when I was in 20H2.
The system came from factory with no OS from an authorised, reputable reseller. I installed the OS myself both the first time and after the incident started happening, using the same Windows 10 20H2 USB drive (created with the official Windows Media Creation Tool).
Thank you for your assistance btw.