PPSSPP does not require a BIOS file to function. It is a High-Level Emulation (HLE) emulator, meaning it simulates the PSP’s operating system internally to run games directly.
While PPSSPP doesn't need a single "BIOS file" to boot ISOs, it does utilize a folder structure known as Flash0. This is where the PSP’s internal firmware lives. ppsspp bios
Without the BIOS, the hardware is just a collection of inert circuits. The same rule applies to emulation. PPSSPP is brilliant, but it is a "high-level emulator." For 99% of games, PPSSPP does not need a BIOS file because the developers have reverse-engineered the PSP’s functions into the emulator’s own code. PPSSPP does not require a BIOS file to function
However:
Symptom: You enable the real BIOS, but PPSSPP gets stuck on a white screen. Solution: Your BIOS files are either corrupted or from an incompatible region (e.g., a Japanese BIOS on a US game). Try redumping or finding a verified PSP 1001 (US) BIOS. Some advanced features or homebrew edge-cases might behave
