NFS 2012 - Ultimate speed pack DLC problem

Hi,
i downloaded the ULTIMATE SPEED PACK DLC for NEED FOR SPEED MOST WANTED 2012. And, When i run the game and start playing... i can see new cars but unable get it. It tells me to goto Playstation store to unlock.
I have a Jailbroken Ps3 4.3 . Can you Please provide me with a solution to play with those new cars.

Thanks.