For existing emulators (PS1, PS2), you can legally obtain a BIOS by "dumping" it from your own console. This requires a modded console (jailbroken PS2 or PS3) and a USB drive. For PS4 on Android, since no emulator exists, searching for a BIOS is a fool's errand.
When you search for "PS4 Emulator for Android," you will encounter names like: Ps4 Emulator Bios File Download For Android
These are almost always one of three things: For existing emulators (PS1, PS2), you can legally
No. As of 2026, there is no legitimate, fully functioning PS4 emulator for Android devices that can run commercial games at a playable speed. These are almost always one of three things: No
Why? Because the PS4’s architecture (x86, similar to a PC) is incredibly complex. Even high-end PC emulators like Spine or RPCSX (the experimental PS4 emulator for Windows/Linux) can barely run a handful of 2D games. Porting that to ARM-based Android phones is currently impossible.