Lollipop 5.0.1 is a point-release update for the Lollipop version of Android. The Nexus 7 is only available for the Nexus 7 2013 Wi-Fi model and Nexus 7 2012 Wi-fi model. Google doesn’t set the best example in updating its own devices, including having older devices on the latest version and the latest devices on older versions.Alternative firmwares start with the Android Open Source Project (AOSP) and mix in their own selection of third-party apps, user interface tweaks, themes and more.”]