dude you need to open dt04 with afs explorer then unzlib it with the same program next you need to save it on your desktop as a .bin file once you do that open the unnamed_32 with any hex editor program i have a tutorial for renaming balls but it's in spanish but you can see it and just follow instructions on screen you can change boots names doing the same process i recomend to watch it on youtube at 720 hd and expand the video for better view
here's the video
nop dude you run out of luck, sorry!!!
thank you luigi, now i can try to edit the team names... seems to be kind of hard thou