Technically, the only legal way to obtain a BIOS file is to "dump" it from your own physical PlayStation 2 console using a homebrew tool.
Websites that host BIOS files for direct download are often operating in a legal gray area. While many users find them via search engines, downloading a BIOS for a console you do not own is generally considered a violation of copyright law. How to Install the BIOS in PCSX2 Pcsx2 Bios Usa V2.30 Download
Open your PCSX2 installation directory. Look for a folder named bios . If it isn’t there, you can create it. 2. Move the Files Technically, the only legal way to obtain a