Hi W580noob the files in the attachement should help you ;)
(put the files in custom in tpa/preset/custom with a2 uploader )
then the main generic and the
then start SEUS and try to update it
if it will tell you "your phone is already updated" install SEUS directly from the sonyericsson site
i dont know if something else is needed but this is what i had for debranding my w760
hope it helped you ;)