Those three lines are not part of rooting, they are added after you root so that you may retain your root after a future OTA update. If you are indeed rooted, you can simply edit that file yourself and add the three lines to the end of the file. That's how I did it. If you also use Titanium Backup it may complain that the superuser app permissions are wrong and will offer to change them for you. It will change the permission from 4755 to 6755. If you reboot the changes are reversed because of these three lines. I changed all three of mine from 4755 (or 755) to 6755. Both permission types are fine, and no harm done changing them to: chmod 6755 /system/bin/su chmod 6755 /system/xbin/su chmod 6755 /system/app/Superuser.apk There is lots of discussion on any need for the apk to be anything more than 755, and if xbin/su even exists on your phone, it's just a symlink to the actual file in /bin. I just went with 6755 on all three because it doesn't really matter and doesn't hurt either, and keeps TB from complaining.