Samsung is now rolling out a new software update I9505XXUPQG1 for Galaxy S4 LTE smartphone. The update comes with Android July security patch.
The Android July security patch fixes a total of 65 Common Vulnerabilities and Exposures (CVE) in the open-source Android OS. There are 16 additional patches designed specifically for Galaxy-branded smartphones. In addition, the update includes bug fixes and other improvements for the devices.
Software update I9505XXUPQG1 for Galaxy S4 LTE will gradually release to everyone. You can also check manually for updates, go to Settings > About device > System update.
Make sure you have enough charge on your device at least 60% to 70% before downloading the update.