Disclaimer: Downloading copyrighted DLC for games you do not own exists in a legal gray area. This information is for educational purposes regarding games you have legally purchased. Piracy is theft.
With a little patience, a USB stick, and a jailbroken PS3 (or RPCS3), you can restore this lost content. The "new" files are out there—fresh dumps waiting to be installed. marvel ultimate alliance 2 ps3 dlc pkg new
A genuine should scan clean. However, because the scene is unregulated, bad actors sometimes bundle payloads. Disclaimer: Downloading copyrighted DLC for games you do