Bago gamitin ang application na ito, kailangan mong gamitin ang "ADB Tools" upang magbigay ng pahintulot, kopyahin sa ibaba command at exec ito sa isang PC.
Adb Shell PM grant com.fei_ke.greyscale android.permission.WRITE_SECURE_SETTINGS
tungkol sa "ADB Tools": https://www.xda-developers.com/install-adb-windows-macos-linux/
source code: https://github.com/fei-ke / greyscale.
Fixed FC on some device.