After service tools load, select PST=>edit=>type in unlock code: 000000, Select M.IP Default Profile, select DUN NAI, change value to from ##########@dun.vzw3g.com to ##########@vzw3g.com (the # signs represent your phone number that should remain!) and select ok, select save and reboot phone.
That is from this ROM: http://xdaforums.com/showthread.php?t=1864921
Using that ROM, if were a Verizon customer with Unlimited data, that change had to be made for Internet Sharing to work. The "dun." had to be removed from that setting for some reason.
Maybe TheXev could provide some info for you.
Have you been able to get service tools to load? I am having no luck....