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BBB LCD3 Backlight Problem in Android

Efecan YILMAZ
Prodigy 150 points
I'm using LCD3 with BBB, which runs on Android. But I have no control on backlight. I'm trying to change backlight via adb:
echo 100 > /sys/class/backlight/tps65217-bl/brightness
But nothing happens. When I try to change brightness in Android settings, I can see the change in /sys/class/backlight/tps65217-bl/brightness via cat /sys/class/backlight/tps65217-bl/brightness  . But it doesn't work either. What should I do?