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