You'll have to open the 360 to find out what if it's a ms25 or 28..
When is the manufacturing data? Mine is march 2006 so i figured i had a ms25 in which it was. Get Textbooks tutorial from downloads
I couldn't get xread to work, so i had to use this tutorial which was quite simple
http://forums.xbox-scene.com/index.php?showtopic=573693
don't rush this. I printed tutorials out from various sites, compared all details and watched video, spent hours reading through forums.