The save file "System Driver", name in japanese, a PS2 black icon like "Your system configuration" (name in japanese too) with a small icon under the PS2 name.
It contains UPDATED modules for all modules in the ROM and ADDs a lot of new ones, like HDD and DEV9 (HD and Network card)
and it of course updates the modules Messiah 2 patches in the rom, so your only way to boot copies now is turn the PS2 on WITHOUT the memory card plugged.
That should solve all your problems ... Ah ... a remind ... They aren't scanning machines for mods now, but it's something they can come up with in the future, so beware if you plan to do online gamming with your PS2. A modbios like Messiah2 is easily detected by a simple BIOS/modules in RAM checking ...
Aways disable the mod when going online, for safety.
SCPH-10000_GH-001 SCPH-15000_GH-003 SCPH-18000_GH-008 SCPH-30001_GH-005 SCPH-30000_GH-016(V4) SCPH-30001_GH-010(V4)
2xSCPH-10190, 2xSCPH-10350, 2xSCPH-10280
"**** j0 hackers!"
-Sjeep (As seen on TOXIC OS ELF...)