When you refer to a Verizon update what are you referring to? Did you flash an updated ROM? If this is the case & you let the customizations run. Then yes you are screwed but not totally.
You will need to flash back to the Sprint Rom then flash back to the Verizon Rom. DO NOT LET THE CUSTOMIZATIONS RUN!! I have read so many threads trying to get mine to work its hard to keep everything straight.
http://www.ppchaven.com/viewtopic.php?f=19&t=543