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Google has made the Android 5.1.1 factory images available, and you can download them for your 2012 and 2013 Wi-Fi Nexus 7, as well as Nexus 10
Get the links you'll need to install Android 5.0.2 OTA updates on your 2012 or 2013 Nexus 7.
Own a Google tablet and itching for Lollipop? The Nexus 7 Android Lollipop factory image recently leaked, can most likely help you out.