A new firmware update with build number 14.4.A.0.155 has been certified for a number of handsets including the Sony Xperia Z1, Xperia Z1 Compact and Xperia Z Ultra. The update would move the build number from version 14.4.A.0.133 (which only hit selected carrier devices) or the older 14.4.A.0.108 build that saw a global release.
Thanks Sohrab!
