If you own a legal copy of Brotherhood on Xbox 360 and a JTAG/RGH console (for homebrew purposes), installing unlocked DLC is no more illegal than backing up your own games.
Warning: Modifying your console or game files violates the Terms of Service of Xbox Live. This guide is for educational/offline purposes only.
When searching for Assassin’s Creed Brotherhood JTAG RGH DLC exclusive , most people expect the Da Vinci Disappearance or Copernicus Conspiracy . Those were officially released.
No. The process is complex and risky.