To reset your keys all you need to do is swap another ESN on to your account (such as you already did with your 760) then put the Pro back on your account.
Once this is done then do your *22899 and soft reset. Try data, if it doesn't work go into EPST and make sure all the proper settings are
MDN@vzw3g.com and not something else. Also delete the keys from the HA & AAA key fields in the Default Profile. Reboot, test again, it should work, if not report back here.
Last step once you have it working. Follow the link in my sig and back up your HA & AAA keys and save them in a text file or something.