This is Official xbox update and is not recommended for those modded xbox ..
This is the update for Unmodded xbox i.e. xbox having original firmware
The Xbox 360 console software is updated periodically with new features. If you\'re having one of the following problems, updating your console software might fix the problem:
Dashboard themes don\'t appear.
Avatars are missing.
The Kinect sensor doesn\'t work (flashing green or red sensor light).
Note The latest console software includes enhancements to Kinect speech recognition and noise cancellation. You may be prompted to use the Kinect audio tuner after installing the software update.
Note: The version of the console software available here is from June 20, 2012.
Copy to a USB flash drive
If you cannot connect your Xbox 360 console to the Internet, you can copy the console update from your computer to a USB flash drive and then install it on the console.
Note The USB flash drive must use the FAT32 file system.
Plug your USB flash drive into a USB port on your computer.
Download the update file.
Click Save to save the console update .zip file on your computer.
Unzip the file. If you are using Windows XP, Windows Vista, or Windows 7, double-click the .zip file to unzip it.
Copy the contents of the .zip file to the root directory of your flash drive.
Unplug the USB flash drive from your computer.
Plug the flash drive into a USB port on your Xbox 360 console.
Restart the console.
When the console restarts, the installation program starts automatically. Select Yes when you are prompted to update the new console software.
Frequently asked questions
What does the update cost?
Nothing. It\'s free.
How can I tell if my console software is up to date?
If your console is connected to Xbox LIVE, you have the latest console software. When you connect to Xbox LIVE, you are automatically prompted to update your software if an update is available.
Do I have to install the update?
No. However, if you want to play or communicate on Xbox LIVE, you must have the latest console software. New games might also require the update before you play them.
Kinect games might not play properly if your console software is not up to date.
Can I go back to the old software version if I change my mind?
No. Once your console is updated, it will stay updated.