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The debug and retail BIOSes do not differ much, and as a result hackers have been able to create hacked debug BIOSes which can be run on any retail Xbox. Thus, any Xbox can be converted into a Development Xbox. By further studying the debug BIOS, hackers have gained the ability to modify any Xbox BIOS in a way which allows them to load it from the internal hard disk, and then boot it 'on the fly'.