Launch a European game (labeled "PAL" or with an "E" in the serial number, e.g., SLES-00001). If the BIOS works, you will see:
If you see a silver "Sony Computer Entertainment" only (without "Europe") or a gray Japanese logo, you are using the wrong BIOS file. playstation scph5502 v30 europe bios scph5502bin google work
The vast majority of users do not own a SCPH-5502 console nor the equipment to dump the BIOS from the physical chip. Consequently, users engage in "Google work"—searching for the MD5 hash or filename to download the file from "ROM sites" or grey-market repositories. Region mismatch / PAL vs NTSC:
This creates a bifurcation in the ecosystem: Google searches returning malware sites: