Patch your Apple TV without Disassembling It

Last week, the aTV Flash USB key was released. It allows users to patch their Apple TV without disassembling it, and brings support for DivX. Its price is around 60 USD.
Today, our friend Alynpier from the French website http://www.macetvideo.com offer a similar procedure, for free! If it requires couple of sensitive steps, the step-by-step method makes it accessible to most of our readers.