If you have used XBMC before, delete ALL contents of the XBMC directory on your
xbox, except any xml files you have changed, and upload the files in this package.
(This build comes with only ONE skin and does not work with the skins provided
in the 2004-02-12 build. You can install this build into another directory and
keep your 2004-02-12 installation if you wish)
The settings you can change on-screen are stored in /E/TDATA/0face008/settings.xml.
It is not necessary to delete this file when upgrading, your old settings will be
imported. The only reason you may want to edit or delete this file is if XBMC isn't
launching (check the xbmc.log file if XBMC does not start).
Aqui esta la respuesta a todas vuestra dudas