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Update: We've revamped the tutorial to make it easier and more explanatory, check out the new tutorial to disassemble your Xbox 360.
There are thousands of ways to disassemble an Xbox 360you can throw it off a rooftop, you can hit it with a baseball bat, or you can read on and trust in How to do to disassemble your console through these steps and a great video, here goes:
We will need a 2" Allen key and a flathead screwdriver of that calibre as well.
1º) Make sure you have disconnected the Xbox 360.
2º) Put your finger through the front USB slot and press outwards, this will allow you to remove the front cover.