Jtag: The Jtag hack was first exposed by a microsoft employee, some believe he was one of the motherboard technicians of the xbox 360. He realised what was possible of the xbox 360 when he decided to put different software on the console via the servicing points which they first use to flash the nand to the console. He worked out that by opening up the console to do things like run linux could be a useful tool for microsoft and brought it to them with the main marketing idea of it running linux, He was told this was a stupid idea and they shut him down quickly. He later quit his job. Micrsoft made an update for the xbox 360 which blew the E fuses on all the consoles The xbox 360 encrypts things with a perbox key based of specific values and fuses, when a fuse is "blown" it changes the per box key, therefore making the previous encrypted flash (dashboard version 4552) invalid to the console. Microsft believed they had fixed this exploit but in reality the exploit had not been released by the fired employee. it was released a few months after. This explot was only 100% fixed in the early august dashboard update 2.0.8498.0. Thanks for reading!