CodeBreaker v7.0 is notoriously known in the PS2 homebrew community for being unstable on certain console revisions. Unlike later versions (v8.0, v9.0, v10), v7.0 lacked updated "Day 1" server support (which is now defunct) and had specific boot instructions that conflicted with the bios of later PS2 Slim models.
If by "paper" you mean a written guide or document: code breaker ps2 v7 0 fix free
If you're looking for a fix for version 7.0 of Code Breaker, here are a few suggestions: CodeBreaker v7
The widely accepted "fix" in the community is the CodeBreaker v7.0 "Hacked" or "ELF" version. consider these modern alternatives:
If you cannot find a working Code Breaker PS2 v7.0 fix free, consider these modern alternatives: