HT4972: iOS 4: Updating your device to iOS 5 or laterLearn about iOS 4: Updating your device to iOS 5 or later
Currently Being ModeratedMar 18, 2013 1:05 PM (in response to chowara)
The ability to update over the air comes with iOS5. Since you don't have that you must connect your iPad to its syncing computer, open iTUnes and update the OS that way.
Currently Being ModeratedMar 18, 2013 1:06 PM (in response to chowara)
Follow the "Update your device using iTunes" section of this article:
Currently Being ModeratedMar 18, 2013 1:27 PM (in response to chowara)
If you have an iPad 1, the max iOS is 5.1.1. For newer iPads, the current iOS is 6.1. The Settings>General>Software Update only appears if you have iOS 5.0 or higher currently installed.
iOS 4: Updating your device to iOS 5 or Later
How to install iOS 6
iOS: How to update your iPhone, iPad, or iPod touch
If you are currently running an iOS lower than 5.0, connect the iPad to the computer, open iTunes. Then select the iPad under the Devices heading on the left, click on the Summary tab and then click on Check for Update.
Tip - If connected to your computer, you may need to disable your firewall and anitvirus software temporarily. Then download and install the iOS update. Be sure and backup your iPad before the iOS update. After you update an iPad (except iPad 1) to iOS 6.x, the next update can be installed via wifi (i.e., not connected to your computer).