Xperia Z1s 14.4.B.0.37 firmware Android 4.4.4 KitKat update rolling for T-Mobile US users

Sony has finally rolled much awaited Android 4.4.4 KitKat update on T-Mobile Xperia Z1s C6916 for US users in form of 14.4.B.0.37 firmware via PC Companion. Xperia Z1s was launched at CES 2014 event with android 4.3 out of the box. Sony has not updated the latest build on its product page yet.

14.4.B.0.37 firmware brings features like new Xperia home launcher, new Xperia themes, customized Xperia Keyboard, transparent navigation and status bar, white status bar icons, new Sony Media apps, new bootanimation, more responsive touch screen and features like answering machine in call settings. Compatibility with Sony SmartBand SWR10 is also there now.

Xperia Z1s 14.4.B.0.37 firmware Android 4.4.4 KitKat update

Below you can see the Xperia Z1s 14.4.B.0.37 firmware Android 4.4.4 KitKat update notification on mobile.

14.4.B.0.37 firmware notification

14.4.B.0.37 firmware about phone details below.

Note : We noticed that still bootloader unlocking is not allowed on Xperia Z1s C6916 on KitKat update.

Bootloader unlock not allowed on Xperia Z1s KitKat

We will soon try to post the 14.4.B.0.37 firmware ftf for manual flashing.

If you have already updated your Xperia Z1s C6916 on 14.4.B.0.37 firmware, let us know your views on it. Liked the new features. Drop your comments below.

Xperia Z1s C6916 14.4.B.0.37 firmware certified – KitKat update

In month of June we saw a new 14.4.B.0.20 firmware build for Xperia Z1s C6916 getting certified at PTCRB which is expected to be Android KitKat update well now a higher build 14.4.B.0.37 firmware is spotted at PTCRB. At present Xperia Z1s is still on android 4.3 Jelly Bean since its launch at CES 2014 in Jan.

Sony has already updated Xperia “Z” series to KitKat where Xperia Z1 and Xperia Z Ultra are on android 4.4.4 KitKat version. We are still wondering why Sony is so slow with carrier updates. We saw Xperia Z on T-Mobile got its major update after a very long wait.

[ UPDATE – 6 Aug’ 14Xperia Z1s 14.4.B.0.37 firmware Android 4.4.4 KitKat update rolling for T-Mobile US users

14.4.B.0.37 firmware certification

Below you can see 14.4.B.0.37 firmware certification for Xperia Z1s C6916 T-Mobile US on PTCRB.

14.4.B.0.37 firmware Xperia Z1S C6916


A few days back full root was achieved on Xperia Z1s C6916 so if you want to root your device, check the below link.

Root Xperia Z1s C6916 T-Mobile – Install Recovery

We will keep you updated as soon as Sony rolls KitKat 14.4.B.0.37 firmware update on Xperia Z1s C6916. If you are facing any major bugs on present android 4.3 Jelly Bean firmware, let us know. Drop your comments below.

Thanks Ben for the Tip!