Flashtool is probably one of the most useful tools for Sony Xperia devices. It was started by Bin4ry from XDA back in the Xperia X10 days. Androxyde has since taken the lead, continuing to update and build the program with help from other devs such as DooMLoRD. It is an essential tool used to install new firmware versions using FTF firmware files.
The latest version of Flashtool (0.9.15.0) is now available to download from the Flashtool site. The update brings support for Sony’s new 2014 Xperia devices. So if you’re planning on buying any of the new devices, including the Xperia Z2, then you should download it now to get yourself ready.