The official Android 4.3 firmware update FTF for the Xperia Z (C6603) and Xperia ZL (C6503) is now available thanks to Androxyde over at XDA developers. Firmware build 10.4.B.0.569 represents Android 4.3 for both handsets, but it is unclear at this stage whether this is the final build that will roll out to consumers. Androxyde has tagged this release as “Commercial&Journalists”, although there’s a good chance that this is the build that will roll out in the next few weeks. Hit the download links below if you want to give it a try. In the meantime, we’ll keep you posted once the Android 4.3 update rolls out for real.