I've downloaded it from Xperifirm and created the .ftf with Flashtool, it's the Customized BAL one, but it might work the same as another else.
Just follow the flashtool general steps to flash, and that's it.
Sony Xperia Z2 5.0.2 Lollipop Customized BAL ftf
Version: 20.1.A.0.690 (5.0.2 Lollipop)
Branding: Customized BAL