While most "one-click" downloads found on random websites are still suspicious, the following are the recognized, legitimate ways to modify an Xbox 360:
Until recently, the phrase was often associated with scams or "fake" softmods. Historically, the Xbox 360's robust Hypervisor security required hardware modifications like JTAG or RGH (Reset Glitch Hack) involving soldering. Xbox 360 Jailbreak Software Download
This is the closest thing to a "software jailbreak." It exploits a race condition in the Xbox 360 Hypervisor. While most "one-click" downloads found on random websites