the Nexus 5 will receive an update to Android 4.4.3 starting today,reported by T-Mobile support. T-Mobile promised the Nexus 5 smartphone and the Nexus 7 tablet would start to receive Android 4.4.3 beginning June 2.
The Nexus 5 update will bump the device up to build KTU84M, while the Nexus 7 will be moved to KTU84L. T-Mobile specifically refers to security enhancements and various bug fixes. However, reports of the impending KitKat update have surfaced at other times over the past month. So Nexus 5 and Nexus 7 owners may not want to believe it until they actually see it.