Google delists DMCA-infringing content. Sony is notoriously aggressive about protecting its intellectual property. Searching "scph5502bin download" directly yields results, but they are often filled with malware, fake files, or old GeoCities mirrors.
Here is what happens when you search "scph5502.bin" or "PlayStation SCPH5502 V3.0 Europe BIOS" on Google: playstation scph5502 v30 europe bios scph5502bin google
The BIOS (Basic Input/Output System) is the "soul" of the console. It contains the code that initializes the hardware and provides the necessary instructions to boot games. The is highly sought after for several reasons: Google delists DMCA-infringing content