The official Android 5.0.2 Lollipop update (version 10.6.A.0.454) for nearly all the variants of Xperia Tablet Z has arrived. The FTF package for SGP311 and SGP321 versions can be downloaded via the direct download links available below.
Download 10.5.1.A.0.283 FTF for Xperia Tablet Z SGP321 (Vodafone UK)
Sony has just gone live with the latest Android 4.4.4 KitKat firmware update (build number 10.5.1.A.0.283) for the 4G-LTE variant of its Xperia Tablet Z (SGP321) in several European countries including Switzerland, UK, Spain, Scandinavia, Germany, Bulgaria and Czech Republic on Vodafone and Swisscom networks. You can download its FTF package through links given in this article below.