: In your emulator settings (such as RetroArch Core Options ), select PSXONPSP660.bin as the primary BIOS to ensure the system doesn't revert to a less compatible HLE (High-Level Emulation) BIOS.
The psxonpsp660.bin is a decrypted firmware dump taken from the PlayStation 3’s "PS1 Emulator" package (specifically from firmware 6.60). When you convert a PS1 game for the PSP, the converter injects this file into the EBOOT. It acts as the . psxonpsp660bin better
For advanced users, you can apply the bin globally: : In your emulator settings (such as RetroArch