AT&T has released Android 5.1.1 update for its Nexus 6 users. Reuters/Gustau Nacarino

In May, Android 5.1.1 Lollipop with build number LMY47Z was rolled out by US Cellular and Sprint to their customers. Now AT&T has announced the arrival of the Android 5.1.1 update for its Nexus 6 users. The firmware update will be made available over the air. In order to download and install it, users need a Wi-Fi connection.

According to Android Authority, the size of the OTA update is 81 MB and its installation brings stability improvements to the device. Also, when the EAS password is enforced, the Smart Lock feature is disabled. The update is being rolled out in phases, so not all the Nexus 6 models will receive the new firmware at the same time.

Instead of waiting for the OTA notification, users can manually confirm the arrival of the update by checking for software updates through Settings of the device. In order to perform OTA update through Wi-Fi, users are required to charge at least 50 percent of the battery. AT&T says only 1 percent of the Nexus 6 devices will get the OTA update on day one, but it will be available to all Nexus 6 owners by the end of the week.

Nexus models are among the first devices to receive the latest Android build. However, if a Nexus device is purchased through a carrier, it may take longer for the handset to receive firmware updates. Hence, it has taken AT&T longer to roll out the update than Sprint and US Cellular.

The Nexus 6 is a phablet built by Motorola that comes with a big 5.96-inch display. It is the first smartphone to come preinstalled with Android 5.0 Lollipop. Compared to predecessor models, Nexus 6 sales have been declining, mainly because of its hefty price tag, Google 9 to 5 reported. Now, it is available with a price cut of $150 on both 32 GB and 64 GB storage versions at the Google Play Store,, Amazon and Best Buy. The Nexus 6 is expected to be replaced by Nexus smartphone featuring Android M later this year.