However, development is moving fast. Projects like (an unofficial port) and AetherSX3 (a rumored but unconfirmed sequel to AetherSX2) are in early experimental stages. For these experimental builds, you still need a valid PS3 BIOS file.
If you still want to experiment, here is the only legitimate pathway—but manage your expectations. Performance will be poor, even on flagship phones. Ps3 Emulator Bios File Download For Android High Quality
The most reliable and legal way to get the necessary files is directly from Sony. However, development is moving fast