As emphasized, you must dump it from your own PSP. Do not search for pre-packaged "psxonpsp660bin extra quality" on ROM sites—those files often contain malware or modified logos. Use open-source dumping tools on your own hardware.
The file is a specialized PlayStation (PSX/PS1) BIOS image originally included in the PSP (PlayStation Portable) firmware 6.60 . While "traditional" BIOS files are extracted from original PS1 hardware, this specific version was optimized by Sony to run on the PSP's internal PS1 emulator (POPS). Technical Overview Origin : Sony PSP Firmware version 6.60. File Specifications : Size : 512KB. psxonpsp660bin bios file extra quality
BIOS. It offers better performance and fewer glitches than the original 1994/1995 SCPH files. Learn more As emphasized, you must dump it from your own PSP
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Format your memory card within the emulator after switching to the 6.60 BIOS. Older BIOS formats are not 100% compatible. The file is a specialized PlayStation (PSX/PS1) BIOS