It has been a long time coming for Sony Xperia Z1s owners here in the states on T-Mobile, but you all finally have Android 4.4.4 updates pending your install.
The firmware version is 14.4.B.0.37. You will be prompted through the device about the update, but the Sony PC companion app is the only way to install it, as you can see above. With the update you wills e the newer Xperia home launcher, transparent navigation and status bar, white status bar icons, improved stability, Wi-Fi calling, better reception, better audio and improved touchscreen response. Along with compatibility for the Sony SmartBanf SWR10.
If you don’t have the Sony PC Companion app on your PC yet then you will want to get that up and running first. You can download it from Sony. Your device should prompt for the PC Companion software to be installed anyways though. This update will most liekly break root if you have it, but it should be easy to root again. It also still keeps the bootloader locked.
