Hello,
To Softmod your xbox you need a memory card and a copy of either Splinter Cell, MechAssault or 007 Agent under fire.
Use your Chipped xbox, hook up the controller to port 1 then insert the memory card in the controller.
Now boot up with the AID disc, scroll down the menu to `Advanced options`
then to `install SID 5.1`
Pick your game, either Splinter Cell, MechAssault or 007AUF
Then select `Install to mem card 1A`
Thats it for your chipped box, stick the controller in your unmodded console and copy the game saves (SID 5.1) from your memory card to your xbox hard drive. (you have to press right on the D-pad for the `copy` option to appear)
Now insert Splinter Cell game, press A on controller & load the Linux profile.
Select the second option - `create MS backup` - let it do its thing, then select the first option - Install softmod
Go with `single boot` `standard` `UnleashX dash`
Let it install, then reboot ....... you can then use the softmod section of the AID disc to make XBMC your default dash.
Easy