I've tried everything that I can think of to try and root my Razr Droid Maxx HD Verizon phone, running 4.4.2.
Towel root, sunshine and I can't even remember all of the others I tried. Nothing works!
Successfully used the Hydrogen Peroxide method as outlined at this link.
Had to reflash stock firmware a priori though. Others had success without flashing, only factory reset prior to attempt.
Newest Kingroot or KingoRoot would be worth trying 1st.