Ensure the file ends in .bin . If it's in a .zip or .7z file, you must extract it first.
If you'd like help for a certain game or need the step-by-step for dumping your own hardware , just let me know!
In the context of emulation, the specific file size does not dictate performance. Emulators like AetherSX2 (and PCSX2) are programmed to be compatible with several different BIOS versions. While the SCPH-77001 (a 4MB file) is popular, the earlier SCPH-10000 or SCPH-30000 series BIOS files (which are usually larger, around 8MB because they contain DVD player firmware modules) are equally functional.
Certain games require specific BIOS regions (USA, Japan, Europe) to boot.
The BIOS dumps from these consoles vary slightly in file size. When users search for a "4MB" file, they are usually looking for the BIOS from the later Slim models (often version 2.20 or similar). These files typically extract to around 4 megabytes (often specifically or 4,096 KB ).