I have a fully flashed Hero, that for some reason the setting (all but MDN and PRL) revert back to the original carrier Cellular South.
I have re-written the NV's changed all the credentials in both CDMA WS 3.5.5, CDMA 2.7, and get an NV file write error message in QPST.
It seams to revert after about the 3rd time of turning the phone off and on.

Open to suggestions.