If you ignored the warnings and downloaded a BIOS file called scph90001.bin , verify its integrity:
Ensure the files are completely unzipped. PCSX2 cannot read a BIOS hidden inside a .zip , .rar , or .7z archive.
The PS2Dev Wiki is a community-driven resource for PS2 development. You might find the BIOS file you're looking for there. Ps2 Scph 90001 Bios Download
The BIOS (Basic Input/Output System) is the core firmware that tells the PS2 hardware how to start up and run games. For the SCPH-90001, Sony made significant changes to the system software:
While various sites offer "PS2 BIOS packs" for download, distributing these files is technically illegal under copyright law. Downloading files from unofficial sources also carries a risk of malware. Dumping the BIOS from your own console ensures you have a clean, compatible file for your specific games. If you ignored the warnings and downloaded a
If you need help setting up the emulator, please let me know: What are you running PCSX2 on?
Go to the bios folder within the PCSX2 directory (usually Documents/PCSX2/bios or inside the emulator's root folder). You might find the BIOS file you're looking for there
If you own a physical SCPH-90001 console, you can extract (dump) the BIOS file directly from your machine using a homebrew application.