I have a droid razr and I am looking to find a way to downgrade it back to ICS from JB. I used this guide http://www.droid-life.com/2012/12/24/original-droid-razr-receiving-mysteriously-large-331mb-update-as-build-98-72-8/
It worked like a charm but I can't get the Wifi tether to work on it so...