Samsung Galaxy S4 has started receiving an official fix for Stagefright security exploit. Considered as one of the worst Android security bugs, Stagefright gives hackers unwanted access to your phone's storage without any phishing attempts, whatsoever. A malicious MMS messageis all that a user has to open for this malware to attack on an Android device. You will receive the official notification to install the update over-the-air. If you don't want to wait, here is how to manually install the official update on your Samsung Galaxy S4.

Model SGH-M919

Model name GALAXY S4

Country USA (T-Mobile)

Version Android 4.4.4

Changelist 2437203

Build date Mon, 24 Aug 2015 06:29:51 +0000

Product code TMB

PDA M919UVUFOH3

CSC M919TMBFOH3

Prerequisites to update Galaxy S4 to M919UVUFOH3 Android 4.4.4:

Please check these prerequisites before going forward to theT-Mobileupdate guide for Galaxy S4.

Downloadand install USB drivers for SGS4 in your computer.Make sure to take thebackupof any important files on your smartphone.Enable USB debuggingoption by pressingMenu>Settings>Applications. Navigateand tap onDeveloper Optionsto ensure thatUSB Debuggingis enabled.Ensure that your T-Mobile Samsung Galaxy S4 carries more than 70% of charge.

How to update T-Mobile Galaxy S4 to M919UVUFOH3 Android 4.4.4 KitKat:

Required files:download the M919UVUFOH3 Android 4.4.4 firmware file for T-Mobile Galaxy S4 fromhereand extract.tar.md5file.Also, download theOdin3 v3.09 for installation fromhere.

Unzip Odin on your computer and install it.Switch yourSamsung GalaxyS4 M919 off and boot it inDownloadmode: press and holdVolume Down, PowerandHomebuttons together.Connect your device with your computer. When connected successfully, you will get a message in Odin sayingAdded!!.(In case you don’t get it, try another USB port. If that doesn't help either, then re-install USB drivers).On your Odin, click onAPand select the. tar.md5firmware file for Galaxy S4.Click onStartto initiate the update process.When Android 4.4.4 update installation is successfully completed, you will get aPASSmessage.You can now disconnect yourSamsung Galaxy S4and reboot it.

Note:Incase your device gets stuck at boot screen after installation offirmware file, perform data wiping tasks: turn off S4 and reboot it into recovery mode. In recovery, select thewipe data/factory reset. Go back and reboot your smartphone.