Samsung Galaxy S4 is expected to receive the the Android 5.1.1 Lollipop's official over-the-air (OTA) update as older and mid-range smartphones and tablets of the tech giant are slowly receiving the same update. Android's Lollipop's final software version is slated to bring in performance optimization, security patches and several other improvements.

While many of Samsung Galaxy S4's system are currently running on Lollipop launcher and KitKat versions, software update is expected to jump to Android 5.1.1 Lollipop as older phones and tablets already received the update. According to rumors, the upgrade might begin in October or as the year ends.

Although there have been no concrete evidence or any official statement from Samsung and partner carriers, the final Lollipop version becomes imminent now to roll out to Galaxy S4 since phones like Galaxy Mega 2, Galaxy J1, Galaxy Tab 4 8.0 and Galaxy Core Prime have already received the same update.

Mobile carriers Verizon Wireless, T-Mobile, Sprint, AT&T, US Cellular, Bell and Vodafone have not expressed any news on the said update. However, there are Android patrons and tech analysts who believe the Android 5.1.1 Lollipop update is coming to the device as well as to unlocked versions.

Current Android software versions of Samsung Galaxy S4 are as follows:

The OTA update will come when device is connected to Wi-Fi. If prompted for the update, click "Install Now" and follow onscreen instructions. To manually check for it, head to Settings > About phone/device > Software updates > Check for updates. Before proceeding with the installation, charge up device to at least 50% while storage should have enough memory space depending on the file size.

Android 5.1.1 Lollipop comes with improvements in Material Design user interface, fingerprint scanner and USB Type-C support, device sharing, and device sync, among others.

Meanwhile, a custom GPE ROM based on Android 5.1.1 Lollipop is made available for Galaxy S4 units for those who cannot wait for the official OTA release.