help for brightness slider / decrease brightness on lumia x20

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:

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PATH  :HKLM\SOFTWERE\OEM\Nokia\BrightnessInterface
KEY    :BrightnessPct     
VALUE  :100                                                                   
 

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