It works!!! Cancel help request!

I looked at the backup file I made originally, and it revealed that my Cingular w300i was originally a "R4EA031", which I had apparently clobbered beyond recognition with my early careless attempts at flashing, so I loaded these:
W300_R4EA031_MAIN_GENERIC_JE_RED49.mbn
W300_R4EA031_FS_AMERICA_2_RED49.fbn

I now have a nice Generic w300i with the email client restored and all of that dang Cingular hacking removed. Thanks for the great website!

I donated a meager 5 euros, but it would have been easier if the donate button sent me to an English version of Paypal.