To extract the BIOS from your console, you will need a PS2 equipped with or FreeHDBoot , or a way to run homebrew software (like an exploited game).
The PS2 SCPH-90001 (often referred to as the "Super Slim") is the final revision of the PlayStation 2 console . Its BIOS, typically named ps2-0230a-20080220.bin
While individuals are rarely sued for downloading a BIOS, ISPs may issue warnings, and download sites face frequent legal takedowns. More importantly, many "free BIOS download" sites are laden with malware, keyloggers, and ransomware.