I've tried everthing that I can think of to try and root my razr droid maxx hd verizon phone. Towel root, sunshine, and can't even remember all of the othes to try a root it. Nothing works ! It's running 4.4.2
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.