Because the BIOS is copyrighted Sony code, it is with the AetherSX2 app download. To use the emulator, you must provide your own BIOS file. Without it, the emulator simply won't start. Why do you need the Japan BIOS?
To ensure the best compatibility with Japanese titles (like Persona 4 or Monster Hunter G ), you are looking for the or SCPH-39000 Japanese BIOS files. Step 1: Locating the File
Downloading BIOS files for consoles you do not own is a legal gray area. We recommend using files dumped from your own hardware whenever possible.
Tap "Import BIOS" and navigate to your "Downloads" folder. Select the Japanese .bin file you just downloaded.
How to Download and Setup the AetherSX2 Japan BIOS: A Complete Guide
Tap the three horizontal lines (menu) in the top left corner and select App Settings . Go to the BIOS Tab: Tap on the "BIOS" category at the top.