: The safest way to obtain BIOS files is through official channels. For PSP users, this often means checking updates on the official Sony PSP website or through the console's built-in update mechanism.
psxonpsp660.bin file is widely considered the gold standard PlayStation 1 (PSX)
If the file size is 0kb or extremely small, the file is corrupted. You must redownload or re-dump it.
folder of your emulator (e.g., in RetroArch, this is usually the folder; on Miyoo Mini, it's the directory at the root of the SD card). Case Sensitivity