Since your console is "hard-modded" (JTAG or RGH), you have the unique ability to run unsigned code, allowing for more powerful mods than a standard console:
: You can bypass the story entirely by downloading a "100% completion" save file and injecting it into your profile using tools like Horizon or Velocity . Game Installation (JTAG/RGH) To run GTA IV from your internal or external hard drive: Grand Theft Auto IV [Jtag/RGH]
: Dial 486-555-0100 for a health/armor/ammo refill or 486-555-0150 for an advanced weapon set. Since your console is "hard-modded" (JTAG or RGH),
: A popular and long-standing menu for GTA IV on RGH/JTAG that allows for spawning vehicles, changing weather, and invincibility. For Grand Theft Auto IV on a modified
For Grand Theft Auto IV on a modified Xbox 360, you can customize your experience using mod menus, custom saves, or by installing the game directly to your hard drive. Mod Menus & Customization