The RGH exploit takes advantage of a vulnerability in the console's reset process. When the console is reset, it executes a series of checks to ensure that the system is functioning properly. The RGH exploit injects a custom reset signal into the console, which bypasses these checks and allows for the execution of unauthorized code.
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The Xbox 360 console uses a Xenos GPU, which has a JTAG interface. The JTAG interface is used for testing and debugging purposes. However, this interface can also be used to execute custom code.