OK, you got me.
That tutorial asked me remove Backlight.kext from wherever I installed it before, so I removed them together accidentally.
After I put back the original AppleBacklight.kext, everything worked like a charm.
Thank you, problem solved.
My laptop Backlight control is not working with 10.12.6.
I have followed the RehabMan's tutorial [Guide] Laptop backlight control using AppleBacklightInjector.kext
https://www.tonymacx86.com/threads/guide-laptop-backlight-control-using-applebacklightinjector-kext.218222/
With this tutorial, I...
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