Android 5.1 was released only a few days ago but many developments have already taken place. Updating the device to the latest Android version has only one disadvantage. You will lose your root access. Luckily, Nexus 5, Nexus 6 and the WiFi version of the Nexus 7 2012 running on Android 5.1 have received the root access. For this you will need a custom recovery like CWM installed on the device. Follow the guide below to root the device.