Searching for retro software binaries carries risks. The internet is littered with "download" portals that act as vectors for malware, adware, and broken files. When looking for a CodeBreaker ELF, you are treading in the waters of abandonware.
Below was a 256-character hex string. A master decryption key for every pre-2006 PS2 save file, debug menu, and prototype ROM. codebreaker 101 elf ps2 download top
For running the ELF file, you'll need a tool like uLaunchELF. Searching for retro software binaries carries risks