Using modified files while signed into the PlayStation Network (PSN) carries a high risk of a console or account ban. It is best used strictly offline.
Follow this exact method (based on the original DUPLEX NFO instructions): wwe13alldlcunlockerps3duplex
On the PlayStation 3, purchasing this DLC legitimately tied the license to the user's PSN (PlayStation Network) account. The console would check this license before allowing the user to access the content in-game. Using modified files while signed into the PlayStation