Sony Z3v- How Do I Flash 5.0.2 FTF File?

As you may all know, the FTF for Android 5.0.2 is finally available for the sony Z3v. However, I have no idea how anyone is getting it installed. I have a non-rooted phone that is currently on the latest software version sent out by verizon. I have tried on both a mac and a pc using flashtool and the FTF file dowloaded from xperiablog, and I am unable to complete the process. Could anyone post detailed steps on how they upgraded theirs to lollipop. Would greatly appreciate it.
Thanks!