Modified software often lacks the latest security patches, which can permanently disable (brick) the phone you are trying to fix.
Most professional unlocking tools (e.g., Chimera Tool, SigmaKey, Octoplus) operate on a paid subscription or credit-based model. The term "activation" in the subject line implies the user is seeking to use these premium tools without paying. This usually requires a "Crack" or "Patch"—a modified executable file that tricks the software into believing a valid license exists. unlock tool activation free fixed