I recently wrote a post on my AT&T Nexus 6 getting Android Lollipop 5.1. There was some confusion on my part on how to exactly get it right, but after experimenting and having others users confirm this method I can now give clear instructions on how to get the latest update, and let me tell you, the update is worth getting if you are tired of your phone rebooting, having poor battery life, or experiencing other random bugs.
1. Backup your phone – go to “settings” and then go to “backup & reset.” This will allow you to reset your phone to the exact way it was before the restore. Select an account to backup your phone, and then click to back it up.
2. Take out your Sim card. You can do this with a Sim ejector tool or something small like a bent paperclip. if you leave your Sim card in you will not be prompted to get the update. You MUST remove it.
3. Restore your phone – go to “settings” and then go to “backup & reset” and hit “factory reset data.”
4. When you are restoring your phone, you can restore from the latest backup. Once you do these steps you will be prompted to update your phone to Android 5.1. This update is not due out until June, so if you are tired of the bugs, I highly suggest you get this update.