Unable to switch the led by using cmd on Letv - LeEco Le 1S Questions & Answers

Hello all, need a help solving a problem. I want to switch the back -led on and off. i can access the sys/class/leds/button-backlight and can change the brightness of the variable to "170", the thing is the variable's value is changin, but the LED is not glowing! ,i tried "1" and it has the same response. Lemme post a screenshot indicating my situation here!
My device : Letv Le X509
Status: Rooted
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This screenshot indicates the files that i have within the leds folder.

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