Help with Persona 3 Portable missing textures

[Vivian isa Cute]

Hello, I'm new here and I wanted to as for help because I'm having a problem with the textures of the game. At first it was just that a weapon appeared in the middle of the battlefield in each battle, though it was not a problem for me it got worst when Akihiko joined the party because it looks like his hair is missing in his 3D model, some enemies become invisible outside of battle and even some warp points disappear too. I tried to change the backend and the texture filtering but it does not work, installing higher resolution texture didn't work neither.
Can anyone help me with that?

[AkiraJkr]

You either modded this game to death(Because Akihiko's model is not like that) or your ISO is corrupted.