XDK Debug BIOS

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The XDK Debug BIOS, is an alternate BIOS created by Microsoft for Xbox gaming system. It is included in Debug Xbox consoles that are used by game software developers. It differs from a Retail BIOS by allowing the Microsoft XDK to link with the Xbox while it is executing code and receive feedback. It also allows for the running of code not digitally signed by Microsoft, similar to a hacked Retail BIOS, since finalized code must be submitted to Microsoft for a key to run on unmodified Retail consoles.