If you have downloaded "all ps2 bios files including the new scph90006 patched" and encounter issues, here is the fix list.
Lay all the BIOS files side-by-side:
Each file is exactly 4 MB (uncompressed) but contains subtle shifts in the ROM image. The patched 90006 has a unique checksum (CRC32: D3E5F2A1 versus the unpatched A9C8B4D7) and features a string in its hex dump that reads: "SECURE VERSION: 0xFFFF"—the maximum security level, compared to 0x0 on early units. all ps2 bios files including the new scph90006 patched
The patched 90006 is gaining ground for three reasons: If you have downloaded "all ps2 bios files