The Xbox 360 modification scene is defined by two primary methods that allow a console to bypass Microsoft’s official "signed" code requirements:

This paper explores the intersection of the video game Motorcycle Club and the specialized hardware modifications for the Xbox 360 known as (Joint Test Action Group) and RGH (Reset Glitch Hack). While the game itself is a standard racing title, the "[Jtag/RGH]" tag in digital communities signifies a version optimized or packaged specifically for consoles capable of running unsigned code. 1. Understanding the Hardware: JTAG and RGH

When Motorcycle Club is labeled for JTAG/RGH systems, it refers to the game being played on a "Jailbroken" console. This grants several enhancements not possible on retail units: Xbox 360 RGH and JTAG explained - Console Wizard

A software-based exploit that utilizes a vulnerability in early Xbox 360 dashboards (version 7371 or lower). It is prized for its near-instant boot times and stability, though consoles compatible with JTAG are now extremely rare.