Xbox 360

JTAG

JTAG only works on older "phat" consoles built before this vulnerability was patched in manufacturing. Confirm your motherboard revision before committing to this route.

JTAG is the original Xbox 360 homebrew method. It exploits a flaw in early bootchains that lets a modified NAND image instruct the processor to hand control to unsigned code at startup. Because it leans on software and a flashed image rather than precise timing, it is famously stable on the consoles that support it.

How the process is staged

Identify the console
Verify the motherboard is an early revision that still carries the unpatched vulnerability.
Read the NAND
Use a NAND programmer and J-Runner to dump the flash and recover the CPU key.
Apply the exploit
Have J-Runner build a JTAG-enabled image keyed to this specific console.
Write the image
Flash the modified NAND back to the console.
Boot XeLL
Confirm the console now boots the homebrew loader.
Set up a dashboard
Install a custom dashboard for everyday use.

If your console is too new for JTAG, a reset-glitch method such as RGH is the path forward instead.