Here is the context regarding this file:
Sony spent years perfecting the PSP’s ability to play "PS1 Classics" from the PlayStation Store. The code within the 6.60 firmware is highly refined. Some users find that games which "glitch out" on standard BIOS files run smoother when using the PSP-extracted version. 2. Region-Free Capabilities psxonpsp660bin bios file
: Users often report reduced stuttering and smoother performance in demanding titles compared to older BIOS versions. Enhanced Compatibility Here is the context regarding this file: Sony
: Unlike the original hardware BIOS files (which were locked to Japan, US, or Europe), the PSP BIOS is largely region-agnostic and can boot games from any territory [2]. psxonpsp660bin bios file