[Q] Need Help Rooting Lg G3 topic

I recently rooted my lg g3 ls990 on stock firmware using stump root. but i could not get mobile data to work, i had signal i could text and call just no mobile data. So i tried installing cyanogenmod and i lost root privileges. Is there any way to re root on cyanogenmod. i tried stump root but it wouldnt work with stump root, says device not supported. Any ideas ??