Use the Wi-Fi feature of your PS Vita system to update the system via the Internet.
To perform an update using Wi-Fi, select Settings > Start > System Update > Update Using Wi-Fi in a location that has an access point you can use. Your PS Vita system automatically checks over the Internet whether you have the latest version of the system software. If there is an update file for a later version, it is downloaded to the system. Follow the screens to complete the update.
You cannot perform an update using data transfer over a mobile network (3G).