T-Mobile Galaxy S4 SGH-M919 can now be updated to Android 4.4.4 Kitkat using CM11 M9 Custom ROM, this ROM brings the Android 4.4.4 Kitkat firmware on your device. This update to CM11 brings so many bug fixes and some minor changes. The ROM brings improved Theme support, Touch etc. If you are interested in Android 4.4.4 Kitkat then this ROM is better suitable for your device i.e., T-Mobile Galaxy S4 SGH-M919.
How to update T-Mobile Galaxy S4 SGH-M919 to Android 4.4 KitKat firmware via CM11
Step 1: Download CyanogenMod Android v4.4.4 KitKat CM11 M9 Custom ROM (here) and Google Apps to your PC.
Step 2: Connect Samsung Galaxy S4 SGH-M919 to PC via USB cable.
Step 3: Then, transfer Custom ROM zip file into the phone’s SD card memory.
Step 4: Now, turn off the device and disconnect from the PC.
Step 5: Then perform the regular Recovery Mode sortie by press holding ‘volume (up)’, ‘home’ and ‘power’ buttons.
Step 6: After entering the RECOVERY mode, perform full data wipe, by choosing ‘wipe data/factory reset’
Step 7: Now, clear the cache memory by selecting ‘wipe cache partition’
Step 8: Then to go back to ClockworkMod recovery, and select ‘advanced’ and tap ‘wipe dalvik cache’
Step 9: Again come back to main recovery screen and then tap ‘install zip from SD card’
Step 10: Then tap ‘choose zip from sdcard’ and go to Android 4.4.4 ROM .zip file in SD card and enter the installation process. Repeat the same procedure again to install the Google Apps. [Note: use ‘Volume’ keys to navigate and ‘Power’ button to select options]
Step 11: Once done with the installation process, navigate to ‘+++++Go Back+++++’ and re-start the device by opting ‘reboot system now’ seen in the recovery menu.