cant. u can but its complicated, and if u have to ask what to do i think its outa your league. if u have a 1.0-1.5 xbox then do a TSOP its very easy to do.
The only way your gonna fix your xbox is too rip out the old hard drive get a new one and chuck a mod chip in.
i dont know all mod chips off by heart but im 99% sure that any mod chip will let you do that. (hdd upgrade is pretty standard)