If you cannot get v10.1 working, consider these alternatives:
That said, no alternative has the database size or GUI simplicity of CodeBreaker v10.1. codebreaker+v101+ps2+iso
For unmodded consoles, you need a PS2 Swap Magic disc. For modded consoles (Matrix chip, Modbo): If you cannot get v10
Step 1: Download the ISO. Do NOT extract the files. Step 2: Open ImgBurn (Windows) or Burn (Mac). Use 4x write speed. Use high-quality DVD-R media (Verbatim or Taiyo Yuden). Step 3: Burn the ISO as a "Disc Image." Step 4: Place the disc in your PS2. Boot the console. The blue CodeBreaker logo will appear. Step 5: Select cheats, then replace the CodeBreaker disc with your game disc when prompted. That said, no alternative has the database size
Let's address the elephant in the room. Searching for codebreaker v101 ps2 iso occupies a legal grey area.