Obviously this only pertains to the xbox version of xbmc as any version of xbmc you would obtain for windows, linux, or mac would already be new and current. I discovered this by wanting to make my xbox media center to the newer version so i could use the confluence and pm3hd skins. I went to the wiki and could not get the shortcut trick they made to work so i did it the easier way. So that is what i will share with you all here, How to make your xbox media center boot the most current build of xbmc without any cheats or shortcuts or silly workarounds.
Other reasons you would want to do this upgrade is so your xbox would play more file formats. My old dashboard would not play .mp4 and .mkv files at all. It would just freeze. This update fixes that problem.
***Important note, if you do not have a back up of your xbox then do so now. Use the xboxhdm file kit and make a boot disk for your xbox so if you ruin your mod then you can rebuild it and no harm will be done. That will only be needed if you loose power during the file copying process not that ruining your xbox is a sure thing but it is nice to have a back up none the less. Also if you have any questions about this or anything pertaining to xbmc for the xbox just let me know and i will clarify as i have already done everything you can for xbmc for xbox and have encountered problems and fixed them. Don't hold me responsible if you mess your xbox up. That being said lets do this.
Step 1: Obtain the Current XBMC Files
This is the URL that will bring you to the most recent build of xbmc for xbox. It is the build i used for this instructable. It is in a .zip file so unzip it and you will find a folder named Build. Only the files inside the folder will be used. The folder contains all the files that will make your xbox into a fully updated xbmc. You can download the apple movie trailers video plugin and any other plugins that you may want from the svn repo installer program once you're done.