Thank you so much, i tried it twice, because the first time SEUS said that my phone was up to date, and when i reread the directions, i found i forgot to turn it on after transferring the upgrade XML fine.
Now my AT&T branded w760a will be a Sony Ericsson w760i... removing all AT&T logos...
for all other w760 users, hold down the '5' key instead of 'C'