lg g3 s d724

I have lg g3 s woking on lollipop 5.0.2 iI don't know how to install twrp or cwm

G3 Beat D724 5.0.2 20a Impossible to root?

Greetings

i have a huge trouble , since i updated from 4.4 i cant manage to root no mather the method
I had root before and bricked the phone when updating so i flashed everything and downloaded my rom (that is brazillian d724-20a) and installed with LG flashtool
It worked fine has i am using it right now , but then comes the problem , here are the root methods i have tried:Kingroot,Kingoroot,Stump,Lg root script 1.2v - 1.3v - 2.3v and the one with grafical UI,Newest root method 03v (its the lg root but with some changes it is in this forum),purpledrake,manual lg root,and 2 other .
I really need it has i use a gigantic number of apps and things that need root like xposed framwork,busybox,kernels.
I have noticed that i am not the only one that has this problem

The lg root script works fine and enters download mode and even reboot back in the grafical ui root but it does not makes the root when in download mode.

Thanks for any help