Yesterday Sony announced which devices would be getting the Android 4.3 Jelly Bean update, it was basically all the devices in their Xperia Z range, one of those was the Sony Xperia Tablet Z.
Now Sony has released a video showing Android 4.3 ASOP running on the Sony Xperia Tablet Z, and Sony has provided details on their blog on how to get this running on your unlocked Xperia Z devices.
To get Android 4.3 running on your unlocked device, all you need to do is to head over to the device you’re interested in on GitHub (AOSP for Xperia Z, AOSP for Xperia Tablet Z, or AOSP for Xperia ZL). There you will find all the necessary instructions in the Readme file. However, you should note that there are important functions missing and this is not software suited for daily use. This means that you should only install it if you are an advanced developer. You must also make sure that you understand the consequences of unlocking the boot loader. Feel free to drop us a comment below if you have any questions!
You can find out more details about Android 4.3 ASOP for the Sony Xperia Z over at the Sony developers website.
Source Xperia Blog