You need to change the eeporom. There is a program called configmagic and you use that to put a new eeprom onto the xbox. Also to learn a lot more about xbox mods and if you need help go to
www.teamxecuter.com and then on the left click on Community forms. You can learn a lot there even if you don't have an Xecuter mod chip. E-mail or PM me if you need further help. You still might need to get a new xbox live account. (not sure?)