A new firmware update with build number 14.4.A.0.133 has been certified by the PTCRB website for the Xperia Z1, Z1 Compact and Z Ultra handsets. The update would move the build number from version 14.4.A.0.118 (which only hit selected carrier devices) or the older 14.4.A.0.108 build that saw a global release.
The relatively small change in build number suggests this is a bug/security fix. We’ll let you know when the update starts to roll.
Xperia Z1 firmware build 14.4.A.0.133 certified for C6902, C6903 and C6906 variants
Xperia Z1 Compact (D5503) firmware build 14.4.A.0.133 certified
Xperia Z Ultra firmware build 14.4.A.0.133 certified for C6802, C6833, C6843 and C6806 variants
Thanks to all that sent this in!