xbox died do to live

[timex]

A t-sop was installed in my system, I followed tutorials and started backing up my games, today i backed up my rainbow six 3 game and when it loaded it wanted to update the live, now i get the xbox requires service. What do i do now? can i fix this or is it toast. i can still load into evox dashboard but not the msdashboard anymore. someone please respond and help me