Flashtool has been updated to version number 0.9.16, which, amongst other features, supports on-the-fly updating of new device files. Devices are now synced directly from the GitHub repository, so as soon as a new device is added to it, all FlashTool users will have it locally.
The latest update also brings support for the Xperia Z2 Tablet as well as the ability to add your own UpdateURL (to check for firmware updates for your phone) as well as the ability to edit the CDFID to check for an update for your specific phone’s customisation version. To download the latest version click here.