Later revisions of the PS2 (SCPH-90000 slim) patched the ability to read "backup" discs. The only way to launch uLaunchELF on these consoles was through a rare original pressed disc that had an exploit. SLPM-20018 was one of the last pressed discs that worked on the patched slims.
: Some hobbyists replace the game executable on a standard commercial disc (like SLPM-20018) with uLaunchELF while keeping the original system metadata. This "trick" was historically used to bypass region locks or boot homebrew on consoles using older exploitation methods like Swap Magic . Key Functionalities slpm20018ulaunchelfisorar exclusive
: Typically, "uLaunchELF ISO" refers to a bootable version of the file manager that can be burned to a disc or loaded via an emulator. Useful Guide for uLaunchELF ISOs If you have a Later revisions of the PS2 (SCPH-90000 slim) patched