Em also one of the victim
i am rooted (de la Vega ) safestrap installed using Jelly beans 6 & stock Rom as well. i don't know how but i am not being able to get in the recovery to format the device.
Getting "System software not authorized by Verizon Wireless has been found on your phone. Please turn off your phone and go to the nearest Verizon Wireless store for help."
What i do is getting into the download mode and only pressing Volume down to continue boot and Viola my phone restarts every time, but the thing which is pinching me is i can't able to format the phone.. Help required please.