how can i lock my xbox? i have the unleash X version

Hey cearel, thanks a lot, I'll let you know if any link is bad or if i fix it.
again thanks a lot

 

i'm looking for help. my buddy fixed my xbox since the last time i screwed it all up (code 5)and he said that he put a chip to override the hard disk or whatever since i don't know anything about it i believed him but the only problem now is that i don't have the stuff that i used to have before. now i have LINUX and don't have the same effect as the Unleashed version. now my question is if i can go back to have the same Unleashed version has before and uninstalled the chip is in there. thanks.