Update your Apple IPad 1st Generation

Many of you must be thinking it is not possible to Update your IPad 1st Generation.
But hey guys, it is possible...
In the new IPads the settings menu has the option to upgrade it directly through Air.
But as IOS 3.1 (IPad 1st Generation) doesn't has the system of upgrading through air it can be upgraded through ITunes.
Although it cannot be Updated to IOS 6.1 version But its Ok!!!
It can be upgraded to 5.1 Version...

About iOS 5.1.1 Software Update

This update contains improvements and bug fixes, including:

Improves reliability of using HDR option for photos taken using the Lock Screen shortcut
Addresses bugs that could prevent the new iPad from switching between 2G and 3G networks
Fixes bugs that affected AirPlay video playback in some circumstances
Improved reliability for syncing Safari bookmarks and Reading List
Fixes an issue where 'Unable to purchase' alert could be displayed after successful purchase