B7ef81a9.bin [repack] -

To obtain b7ef81a9.bin legitimately, you must extract it directly from your own Japanese SCPH-10000 physical console.

The "feature" of this particular file is that it acts as the system software (firmware) that allows the emulator to mimic the original PS2 hardware. Without it, the emulator cannot boot or play games. Key Details: b7ef81a9.bin

It could be a system file required by the device to function. To obtain b7ef81a9