Then I would just do the easy thing and fxz your phone straight to Jellybean.
Use RSDLite to flash this file
http://sbf.droid-developers.org/cdma_maserati/cdma_maserati_9.8.2O-72_VZW-18_1ff.xml.zip
then use the Razr_blade root method to root. Not only will you gain root, but you'll now be on the latest version of the OS available for your device.