To ensure you have a "verified" or clean copy, look for files that match these common technical specifications (though hashes can vary slightly depending on if the ELF was compressed with UPX): CodeBreaker_v10.1.ELF (or similar)
The utility of Codebreaker 101 is intrinsically linked to the modernization of the PS2 via soft-modding. codebreaker 101 elf ps2 download verified