Real PSP ISOs never end in .exe . If you choose to download, you need trusted, community-vaulted sources (which, for legal reasons, this article will not link directly).
Disclaimer: This article is for educational and informational purposes. Emulating games you do not own is a violation of copyright law. We encourage supporting official releases whenever possible. Attack On Titan Game Ppsspp Isoroms
If you are looking for authentic Attack on Titan handheld experiences, consider these official titles: Real PSP ISOs never end in