This thread is geared toward a 6700 but I noted most of the differences for a 6800. Follow the parts about a prl upload msl crack if you let the sprint cabs run and the MIP edits back to verizon. This will manually restore your phone as this is the process I use when I convert a sprint 6800 over to VZW and data and everything is 100% functional with this method.
http://forum.ppcgeeks.com/showthread.php?t=20090 Do not erase your Ha and AAA secrets unless the HA shows "secret" (sprintized) instead of a bunch of garbled characters (vzw).