The game in question is Super Robot Wars Operation Extend. I have the ISO and the DLC files, put into the ISO directory and the PSP/GAME directory. (NPJH50521 is the name of the folder in the PSP/GAME directory)

When I start the game, it freezes after the opening, and it also doesn't detect that I have the DLC installed. Is this a firmware issue or something else?

Two icons also appear on my XMB bar - one allows me to start the game normally but it freezes after the opening, and the other gives me an error when I even start it up.

Please help me out!