The Xbox 360 security is a lot of turtles and the last turtle is actually baked into the SoC itself so it's impossible to modify. That firmware verifies the nex

The Xbox 360 security is a lot of turtles and the last turtle is actually baked into the SoC itself so it's impossible to modify. That firmware verifies the next stage and establishes the chain of verification that's very hard to break. It did get broken eventually (after years of trying!) by figuring out that the CPU stops being reliable at very low clocks, but it was not even remotely easy.