Here’s a technical write-up for the SCPH-90001 BIOS v1.8 (USA / 230):
, note that the 9000x series consoles themselves patched the memory card exploit used for Free McBoot scph90001 bios v18 usa 230
Elias looked at the machine, then at the disc. The romanticism of the hunt took over. He had spent ten years mapping the architecture of the Emotion Engine processor. He knew the v18 BIOS wasn't just code; it was a mindset. It was an attitude of corporate perfection. Here’s a technical write-up for the SCPH-90001 BIOS v1
Power Efficiency
The v2.30 BIOS was Sony's final attempt to secure the PS2 hardware. FMCB Block: Consoles with this BIOS (Date Code and later) cannot run FreeMcBoot Repair/restore consoles: The v2
If you own a stock 90001, your best bet for playing imports or backups is: