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For those of you on custom ROMs who want to update to the latest Android 4.1.2, if you made a backup ROM of your stock ROM, you can easily do the OTA update.
But if for some reason if you didn’t, here’s a video tutorial on how to unroot/install Android 4.1.2 on your rooted Nexus 7.
Note that this will erase your settings/apps on your Nexus