Modern emulators like (PC/Steam Deck) and AetherSX2/NetherSX2 (Android) do not come with BIOS files included. This is due to copyright laws; the BIOS is proprietary Sony code.
These powerhouses use PCSX2 to run PS2 games at 3x or 4x native resolution. The 70012 BIOS is the gold standard for these devices. scph70012biosv12usa200bin portable
Devices like the Retroid Pocket 4 Pro or AYN Odin 2 rely on this BIOS to provide a "plug and play" experience for the American library of games. scph70012biosv12usa200bin portable
It allows the emulator to show the iconic PS2 startup towers and logo, ensuring the game environment is properly loaded. How to use the File for Portable Emulation scph70012biosv12usa200bin portable