You download J-Runner to your PC. This software contains the XeBuild engine. You will also download your console’s native NAND (via a NAND reader/writer like a NAND-X or MTX SPI Flasher). J-Runner patches that NAND file and creates a hacked dashboard image. You flash that image back to the console.

When the JTAG exploit was patched, researchers looked for hardware timing vulnerabilities.

Reality: No such file exists. If it did, Microsoft would have patched it in 2006. Any "USB jailbreak" is either a virus, a fake survey scam, or a simple game save exploit (like the old King Kong hack) that only works on dashboard versions below 2.0.7371 and still requires specific hardware preparation.

Early versions of the Xbox 360 kernel contained a vulnerability regarding how the hypervisor handled "stack pointers" during the JTAG debugging interface.