Flashtool developer Androxyde has added Android 7.0 Nougat support to the popular Xperia flashing utility. Flashtool build number 0.9.23.0 now allows the ability to flash Nougat FTF firmware files to Xperia devices.
Other changes include TA raw backup for all devices that can be exploited by the dirtycow vulnerability. There is also a new property that will tell you if you need to use a FSC (Flashtool Script) to flash your device or not. The latest build of Flashtool can be downloaded here.
0.9.23.0 is out :) it supports Nougat
— Androxyde (@Androxyde) 21 December 2016