Hi, I was finally able to root my LG G3 D858HK. Point is that the newer versions like v10f can’t be rooted so far by any root software. Therefore, I downgraded my phone to v10D and stump root v1.20 easily rooted with. If you want to download the v10D firmware and other tools, plz check here:
http://forum.xda-developers.com/showpost.php?p=56542760&postcount=80
And how to gain root access check here: http://forum.xda-developers.com/lg-g3/orig-development/root-stump-root-lg-g3-sprint-verizon-t2850906