If you are a Google Nexus 7 or Nexus 4 and living in India, you may start receiving the Google’s Android 5.1 updates through OTA method.
The update package weighs at 174.5MB for Nexus 4 and 101.6MB for Nexus 7. For now, Google hasn’t released the changelog of this update yet, but the update comes with a note: “improves performance and stability and fixes bugs”.
In earlier this month, Google also pushed the Android 5.1 Lollipop for Nexus 5 users, and also listing the factory images for Nexus 5, Nexus 10 and Nexus 7 Wi-Fi model on its official developer page. You can visit this page and download your firmware to flash the device manually.
The update will come to your smartphone automatically and you can see it as a system notification. Nothing yet ? Try checking it manually by going into Settings > About Phone > System Updates.
For other devices, the update will reach you soon.