Just about tried everything to root this and found this.I tried this method on 9.30.1 and it worked for meThis root method was made for the Samsung Galaxy S4, But the OP says may work on others tooHas been confirmed to work on the Razr HD, Razr HD Maxx and the Razr M here and over at my post @ droidrzr.comYou do not need to install the samsung drivers.Just the Moto drivers and make sure adb is working.Enjoy