These archives often also include (compressed ISOs that save storage space) and DLC Packs (downloadable content preserved after the PlayStation Store shutdowns).
Use a tool called CISO (also known as PSP ISO Compressor). A 1.6GB ISO (e.g., God of War ) can shrink to 900MB CSO with no noticeable gameplay slowdown on real hardware. Psp Iso Archive
If you have a PSP-1000, 2000, or 3000 (with Custom Firmware installed) or a PlayStation Vita with Adrenaline, here is how to rip your own ISOs. These archives often also include (compressed ISOs that
Unlike the original PSP’s 480x272 resolution, PPSSPP allows you to upscale games to 4K resolution, apply anti-aliasing, and use texture filtering, making 20-year-old games look remarkably modern. and use texture filtering