Microsoft today released OS version 2.0.17544.0 for Xbox 360 users. This is a minor update with no new features. But this build includes minor bug fixes and improvements. In order to update the OS of Xbox 360, connect your console to the Internet. Follow the below steps to connect to the internet.

1. Press the Guide button on your controller, go to settings, and then select System Settings.
2. Select Network Settings.
3. If prompted, select Wired Network or the name of your wireless network.
4. Select Test Xbox Live Connection.

Source: Microsoft