Insert the USB drive into your PS2 and boot the console into a homebrew launcher like uLaunchELF.
(this represents your USB drive) and execute the BIOS Dumper file.
The SCPH-90001 represents the pinnacle of the official PlayStation 2 hardware. It was the final revision of the PS2 Slim, manufactured from 2008 until the console was discontinued in 2013. This model consolidated all components onto a single, highly efficient motherboard, integrated the power supply directly into the console (eliminating the bulky external brick), and came with the latest official firmware pre-installed.
Highlight the SCPH-90001 BIOS entry and click or Select .