The Google Nexus 5 is going to receive Android 5.1.1 this week, according to Sprint support. The Nexus 5 is going to be the first phone to receive build number LMY48B, which was previously seen in the Nexus 9 and the Nexus 10.
The update was earlier expected be rolled out to the on May 11, but it was delayed due to technical issues.
Although the build has never seen before in a phone, it is nothing more than the update to 5.1.1 with included “security enhancements.” While it is too early to speculate what those security enhancements could be, the upgrade seems quite minor in nature.
Like all the other Android upgrades these days, even this one will be available over the air. If you receive a notification to update your Nexus 5’s software, follow the screen instruction and let your phone restart itself.
You can also receive the update manually by going to Settings > About phone > System updates > Check for update. If the update is available follow the screen instructions otherwise tap Home button.
Source: Sprint support