I download latest update from the update center in Xperia T3, yesterday. After that, verifying failed everytime i tried. I heard that it also occured in Z series. What's the problem? Hope to well soon...
You may try formatting your phone using factory reset. Don't forget to take a backup of your important data as you are going to loose it. If still you can't upgrade then use PC companion.
But my was a different issue i used to get a different error. Could not install.
