sounds like maybe the "User info is not the same". if you downloaded the save then its because its from another account. if its your save that you changed to add trophies or whatever, well then it's because you did it wrong.
Or you could back up your saves and stuff before trying to modify your console as it suggested in the beginning every tutorial. I don't really think that you will see a save editor until after things like a well working media center with MKV support and the new MFW project are done, and maybe not even after that.