Most PS2 BIOS files (specifically those from the SCPH-10000 to SCPH-90000 series) are roughly in size. If you find a file that is significantly smaller or larger (like a few KB or several hundred MB), it is likely a fake, a corrupted dump, or a different type of system file altogether. Where to Get the AetherSX2 BIOS 4MB File

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Place the BIOS file in a dedicated folder on your Android device (e.g., /Internal Storage/Emulation/BIOS/ ).

The BIOS (Basic Input/Output System) is the "soul" of the PlayStation 2 hardware. It is the proprietary software that Sony installed on every console to manage hardware communication and boot up games.