LG K8 (K350z) Android 6.0 ... Root and Xposed Please !!!

so i have LG K8 on Android 6.0 from manufacture
and i want to install Xposed after rooting
i tried a lot of apps and methods but all failed
KingoRoot - iRoot - One click root ......
even tried this method
[GUIDE] New Root Method for LG Devices

but the command didn't succeed #893

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