They are basically changes to team depth charts and player statistical updates.
After several weeks of reading, learning, experimenting, and what not, I've gotten a decent handle on editing Madden (and the EA Sports) series of games for PSP.
Michael Vick and Brett Favre were originally not placed in the rosters for the Philadelphia Eagles and Minnesota Vikings, due to various reasons.
In order to receive the characters, the user must have an internet connection and update their rosters online with their specific console, either Xbox Live or Play Station Online Network.
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