Rumors persist that the SCPH-90006’s BIOS is “region-free” due to its hybrid nature. The BIOS still enforces DVD movie region locking (Region 3 for Asia, Region 4 for Australia). For PS2 games, it blocks titles from different regions unless you use a modchip or FMCB (which is harder to install on 90006 due to the lack of HDD and downgraded exploit entry points).
Projects like and the No-Intro BIOS Collection treat the SCPH-90006 BIOS as a critical data set – not for piracy, but for historical accuracy. scph-90006 bios