PCSX2 1.7.0 does not require a single file; it requires a collection of files for different regions. Inside your PCSX2/bios/ folder, you should ideally have the following sets:
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via a launcher like uLaunchELF. It will automatically save the necessary files to your USB drive Alternative PCSX2 1
PCSX2 1.7.0 leverages the BIOS to emulate specific timing quirks. The scph-39001 (USA v6) is widely considered the most compatible for the largest number of games. pcsx2 1.7.0 bios download