There is a new Android 4.4.2 firmware with build number M919UVUFNK2 on T-Mobile Samsung Galaxy S4 SGH-M919 that can be seen now via Samsung Kies firmware sever. The former could only be just a small update as it has the same kernel build version change-list value to M919UVUFNH7 4.4.4 but it indicates a fresher build as of November 17. As you may know, there is massive firmware update rolled out on T-Mobile Samsung Galaxy series like the Galaxy S5, Galaxy Note 3 and Galaxy Note 4 from the past few days. All of the said firmware updates brings the Chinese language support. No one knows if this could be a preparation of the upcoming Android 5.0 Lollipop. Speaking of the Android 5.0, it had been officially rolled out on the international Samsung Galaxy S5. But this is a Galaxy S4 we are talking about, and there is no confirmation yet if this device also get the said Android 5.0 Lollipop update.
Anyway, the update is now live via Kies as we speak and again the firmware build number is M919UVUFNK2. There are no any official announcement yet from T-Mobile and Samsung about this update, you may try to escalate at T-Mobile support page to get any further for more info when and if you receive the OTA update notification message later on. You may also do try the manual software update checking by heading-over your device Settings>>About Device>>Check for Software Update.
Technical details of Android 4.4.4 M919UVUFNK2
Device Name: Samsung Galaxy S 4
Model number: SGH-M919 (T-Mobile)
Android version: 4.4.4
Baseband version: M919UVUFNK2
Kernel Version: 3.4.0 – 2437203
Build number: KTU84P.M919UVUFNK2
Again, the M919UVUFNK2 4.4.4 update is not officially announced by Samsung and T-Mobile as of this posting. But we will try to gather more info if and when the update is already is officially confirmed and rolling out via over-the-air – OTA update.
Update: It is now officially addressed at T-Mobile’s support page, and the M919UVUFNK2 4.4.4 update also brings the Chines language support. It’s only an optional update that weighs 27.23 MB in size, according to T-Mobile.