Understood about the basic ROM not downgrading the unlocker, never was implying to do so as I assumed you wanted to get the radio back up and a ROM on there, sorry if I want clear on that
as for the partial writes, personally I have no clue what the special ROM is your referring to did you try and find a base radio ROM as suggested and attempt to use that rather than that special one?
try this one 3.42.50
http://rapidshare.com/files/19899365...42.50.rar.html
then try unlocking and flashing again
and make sure your bell carrier cab is there if you dont have it already or are flashing a bell ROM directly
if you are still having issues I would suspect what you stated about the flash memory issue and take it into your store for a replacement
Detroit Doug