How to install:
1.) Extract the contents of 20124160_BETA.rar
2.) Put the $SystemUpdate folder in the root of a CD or USB Stick (Must be FAT or Fat32 formatted)
3.) Insert the CD or USB Stick into your Xbox 360 console.
4.) You will be automatically prompted to update with a USB stick, with a CD / DVD it should say Mixed Media Disc, power down the 360 and power it on again. You should be ask to update before the 360 boots to the dashboard.
5.) Once the update is complete your Xbox 360 will restart then boot up to the new dashboard. Enjoy!
Got this from another forum. But U cant go on XBOX Live with it
f**k that. ill wait