Have the 2012 model of the Nexus 7? Then go ahead and install the latest version of Android. On the Android Developers site, Google posted the Android 5.0.2 factory image for people that like doing things themselves. The factory image posted, though, is only for the WiFi variant (“nakasi”) and Google has yet to post any Lollipop factory images for the mobile data-enabled variant (“nakasig”). The Android 5.0.2 factory image is build LRX22G.