The Nexus 7 (2013) is currently rolling out an over-the-air (OTA) Android Marshmallow update, even though the tablet is over two years old. However, the Nexus 7 (2012) is not in line to get the update.
Google recently disclosed a few changes in their Android updates policies for Nexus devices. Google has guaranteed that after the initial release of a Nexus range, security patches and official software of Android version updates will be made available for three years instead of two. Despite, this change of direction, it is still not clear if this policy will feature older generation devices.
Google is committed to availing the factory images of their software updates on their page for Google Developer Factory Image, with every new release. This also includes the current factory image for the Nexus 7 (2013) Mobile and Wi-Fi variants, with an MRA58V.
To check if your Nexus 7 (2013) has an update available, go to Settings, then in the System section, select About Phone, tap Software update and confirm.
If you want to manually update the Android Marshmallow on your device, you can simply download the zip files shared below and flash it.
As a precaution refer to the steps for installing the Android Marshmallow on the Nexus 5 to flash the Nexus 7 (2013) factory image versions safely on your Nexus 7 device.
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