The golden age of Xbox 360 modding via Horizon is over, but the software remains a functional relic for offline single-player modding. Just remember: on the modern, security-hardened 64-bit web, the easiest "portable download" is often a trap. Stay safe, and keep your console offline.
Tweak your values (such as money, ammunition, or level status). When finished, click the Save, Re-hash, and Re-sign button. This steps computes the unique cryptographic hash required by the Xbox 360 OS to verify the file is valid.