Another thread gave an active link to carrier cabs:
http://forum.ppcgeeks.com/showthread.php?t=47856
->
http://dcd1182.n715dp.com/index.php?dir=carriers%2F
Also found another means to edit the HDR username/password for my upgraded TNZ Titan:
http://wiki.xda-developers.com/index...me=TitanGpsFix
http://forum.xda-developers.com/showthread.php?t=415375
General idea: link via PC using QPST, then edit the PPP->AN->UserID/pswd fields, provided you recorded your info from EPST before upgrading.
(If not, there is a very long thread with a suggestion these codes can be extracted from a full memory dump, looking for the string "secret:"... but don't ask ME how!)