Here’s Sprint Galaxy S4 stock Android 4.2.2 OTA Update firmware build L720VPUAMF9 which can be downloaded directly from Google. This can be installed via recovery option if you don’t get any OTA update notification yet and/or you don’t have to wait to push it trough your phone. Again, this will perfectly work for Sprint Galaxy S4 which is not rooted or runs with modified ROM, it should be 100% pure stock. If you have a rooted Galaxy S4, just read on how to keep your root while applying the update.
This update comes with new features including Samsung Knox, Move Apps to SD option, camera enhancements, HD voice and audio outputs, and it has new looks and a re-vamped design.
Manually Install L720VPUAMF9 OTA Update.zip
Copy the downloaded stock onto your SD card. Rename it to “Update.zip”, renaming isn’t usually required but it much way better for a very long file name.
Now boot your Galaxy S4 into recovery mode. Power it off then hold and press the “Volume UP, Home and Power button” then let go the power button until the phone vibrates and shows you a recovery menu.
Once in recovery menu, scroll down using volume keys then select “Apply update via external storage” press the power button to select that option, then navigate the update.zip file that you copied from your SD card. Simply install it, it will usually takes around 10 to 15 minutes to install a OTA update in recovery mode.
Wait until the phone normally reboots – “upgrading apps, optimizing”, confirming the OTA had successfully installed and until you got the “Android has been updated” pops in.
If you have a rooted phone, just try to use ‘Voodoo Root keeper’ from Google Play Store. Just simply follow the prompts on how to temporarily unroot and/or saves your root. Then run the root keeper to re-instate root access again.