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http://www.sonymobile.com/global-en/software/tablets/xperia-tablet-z/
You may already have the latest software, depending on the date of purchase. Software updates are released at different times depending on operator and/or country. Therefore, we cannot give you an exact date for when a specific update will be available for your device.
Android version: Google Android 4.3 (Jelly Bean)
Latest available software: 10.4.B.0.569
Release started: 2013-12-23