The legally compliant method to acquire this file is to own a physical PlayStation SCPH-5500 console and use a hardware tool (like an Action Replay cartridge, a modded console, or a memory card exploit) to dump the BIOS ROM directly from your motherboard to a PC.
Open your emulator, go to , and select the SCPH-5500 (Japan) option. playstation scph5500 v30 japan bios scph5500bin top
The SCPH-5500 model is highly regarded for two main reasons: its improved hardware reliability and its collectibility. The legally compliant method to acquire this file
Use an MD5 calculation tool to check your file against known, clean database dumps: Open your MD5 hashing utility. Target your scph5500.bin file. a modded console