Android 5.1.1 Lollipop's official over-the-air (OTA) update is reportedly rolling out to all  Samsung Galaxy S2 units across the board. The update is slated to come this year bringing with it performance optimization, security patches and several other improvements.

All Samsung Galaxy S2 devices, both unlocked version and under mobile carriers are expected to receive the official OTA release of Android 5.1.1 Lollipop update in October or December. Although it may seem impossible for some that the device, which is currently running on Jelly Bean, will get the update, many analysts believe the possibility as some older and mid-range devices of Samsung have been receiving Lollipop's final software version through a string of updates in September.

Older and mid-range smartphones and tablets that have received the update are the Galaxy Mega 2, Galaxy J1, Galaxy Tab 4 8.0, Galaxy Note 3, Galaxy Core Prime, Galaxy Grand Prime, and Galaxy Note 4, among others.

Amid the Android 6.0 Marshmallow fuss and frenzy, many Samsung users are hopeful that they will still see a glimpse of the final Lollipop update. 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 S3.

As evident in community forums on tech sites and support pages, fans are calling carriers and Samsung to release the update. Mobile carriers Vodafone, Bell, Sprint, T-Mobile, AT&T, Verizon Wireless, and US Cellular have not expressed any news for the said update.

Meanwhile, 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.