1st thing you need to do is actualy soft mod that console when it arrives..
the safest way to do that would be to use a game save exploit. id usualy use krazies ndere 1.1.1 splinter cell exploit (ntsc or pal) depends on what your xbox is..
your issues come when trying to get the files from the pc to your xbox.
the cheapest way would be to make a usb adapter.
(USB to XBOX) get a usb extention cable and cut it in half,. then you would want to cut your break away cable in half 2..
wire up the usb cable to the break away cable.. (match up the colours, and dont connect anything to the yellow wire)
so you end up with a breakaway cable that has a usb connector you can plug your usb device in to..
then you can make a controller to usb cable. (xbox controller to usb adapter)
simply take the other end of the usb cable and wire it up to the other end of the break away cable. same rules apply match the colours. and dont use the yellow one.
(you should now have 2 seperate wires. one with a attachment that connects to the xbox with a usb female attachment on the other end. and a usb male attachment with the end of the breakaway cable you plug the controller in to on the other end.)
if thats all done correctly you can connect your usb device to the xbox using the usb adpater you just made.
go to your ms dashboard and memory devices, and hope that your usb device is detected "not all will and even if they do not all work"
if yours work. select it in the list and the xbox will format it.
take the usb device to your pc, and use xplorer 360 to put both the numberd folders you will find in the UDATA folder in a rar file you download when you find krazies ndure 1.1.1
then take the usb device back to youyr xbox and move the save files in that to the xbox hard disk..
now all you have to do is run an original copy of splinter cell and go to load game, then follow on screen instructions..
when you have done that ftp the eeprom file you just made to your pc, and come ask what to do next