Why? Because it is the most mature official BIOS. Emulator developers recommend it because:
: Refers directly to internal BIOS firmware version 2.30 . Hardware Evolution: The Final PS2 Slim scph-90001 bios v18 usa 230
Older BIOS variants (specifically the early launch SCPH-10000) are notorious for causing memory card corruption or emulation loops within PCSX2. The v2.30 file contains the most mature, bug-fixed system files Sony ever shipped. and its final major hardware revision
The PlayStation 2 remains the best-selling video game console of all time, and its final major hardware revision, the SCPH-90001, represents the absolute pinnacle of Sony's 128-bit engineering. At the heart of the later production runs of this specific American model lies the . scph-90001 bios v18 usa 230