help for brightness slider / decrease brightness on lumia x20 - Windows Phone 8 Development and Hacking

need an help to change brightness from the minimum brightness or enable brightness slider on non supported phone can be possible
we can change the value 100% to 40% /30% or any%
Code:
[FONT="Lucida Console"][COLOR="Red"]
PATH :HKLM\SOFTWERE\OEM\Nokia\BrightnessInterface
KEY :BrightnessPct
VALUE :100
[/COLOR][/FONT]

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