The Xbox 360 has been cracked open multiple times over the years, and almost every time Microsoft's updates plugged whichever hole let hackers through. The first method was modded DVD firmware in 2006, a hypervisor hack followed in 2007, and a wiring hack exposing JTAG debugging ports was revealed in 2009. The longest-lasting physical hack was 2011's CPU force-reset exploit. That maneuver needed specialized hardware along with a voltage-glitching chip, but an enterprising techie showed how it can be performed nowadays with the assistance of a Raspberry Pi Pico, costing all of $4 (or about 5€ / £5). The crack marks the culmination of a nine-year effort by the modder.
To get the elephant out of the room, yes, just last week the PeerPressure Xbox 360 persistent soft-mod was released. But we're here to talk signals and wires. The aforementioned reset exploit involves sending a teeny weeny tiny signal directly into the CPU's reset pin. You'd think this would do what it says on the label, but what happens instead is that the CPU executes the current instruction incorrectly.
Naturally, someone figured out how to leverage that to run any code on the CPU, thus completely bypassing Microsoft's impressive and frankly rather effective layers of cryptography within the console. Sending said signal for an effective hack, though, requires spectacularly precise timing with a resolution down to nanoseconds, and glitch-chips may even require several attempts to get a successful "latch."
Joshua Kennedy, a Scottish hacker, bought a Matrix Coolrunner Rev D modchip board back in 2017 to hack his console this way, but it required soldering wires, NAND, and programmers, and patience. He once tried rolling his own programmers using an old PC's parallel port (a common substitute), but never got the project off the ground and shelved the idea.
Fast-forward to 2026, and a new tool presented itself: the highly successful Raspberry Pi Pico, a highly capable microcontroller-on-a-stick, whose price starts at all of $4. Armed with this, he started the procedure. He connected the Pi Pico to the NAND interface header on the console to be able to dump the console's NAND flash firmware — a task easily accomplished with just some wiring and the PicoFlasher utility. Although the post doesn't mention it, Kennedy likely took the NAND data, patched it with XeLL, and reuploaded it.
He moved on to download Octal450's Timing Files, a set of mini-programs triggering the glitch chip at the best possible timing to try and reset the CPU. These are necessary because the window of opportunity is different across every hardware revision of the Xbox 360. Enlisting the Pi Pico once again, he uploaded the timing files to the Matrix Coolrunner, and presumably ran the rest of the hack process. And thus the task was complete, and "a project that defeated [Kennedy] in 2017 was made trivial in 2026 by a £5 microcontroller."