Corebook X 14" i3-1220P, the brightness of the display does not adjusted

Laptops CoreBook X
1

Serial: (XCorBXIZ17P25010661)
Was purchased from a DNS store, Russia

The Win11 installed on the laptop was replaced with Win10, after which an SST/Realtek driver issue occured - but it was solved by searching for the appropriate driver based on the device ID. But!
The brightness of the display no longer changes when you press Fn+F6/Fn+F7. The night light mode also does not turn on.
In Device Manager, the Display and Video Adapter drivers are displayed as “Basic driver (Microsoft)”.

2

I don’t think it was a good idea because:
The drivers are specific to Windows 11.
Windows 10 is a system that will no longer be supported.

3

I know but that was the user’s request
Just want to solve the only remaining problem and stay on Win10

4

UPD: the display issue was solved, but the Realtek driver problem returned. According to the device ID, ver. 9859.1 should work. But it doesn’t.

Switched back to Win11 using a restore point, but the problem is still here.