Sony Xperia Z3 FTF firmware files – Android 5.1.1 Lollipop (23.4.A.0.546)
Xperia Z3 (D6603) 23.4.A.0.546 Nordic Generic (Android 5.1.1)
Xperia Z3 (D6643) 23.4.A.0.546 StoreFront (Android 5.1.1)
Xperia Z3 (D6653) 23.4.A.0.546 Australia Generic (Android 5.1.1)
Thanks Adrian, cachanilla86 and Jenge!