A new firmware update for the Sony Xperia Z1s for T-Mobile has been certified by the PTCRB. Firmware build 14.4.A.0.137 has been certified, this compared to Android 4.4.4 build number 14.4.B.0.37 that started to roll in early August. At this stage, there’s no guarantee that this update will hit the Xperia Z1s, but we’ll keep you posted if we see any signs of it.
