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I have just rooted a Nexus 7 with Android 4.2.2. I now receive a notification for system upgrade to 4.3. I don't want to do this, probably ever, as I want to keep 4.2 for app testing purposes. In Settings > About tablet > System updates and in there it says:
Android System 4.3 Update
[Restart & Install]

How do I prevent the upgrade, ie how to I get rid of that Restart & Install button and to I prevent future upgrades & notifications?

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I don't know the answer to your question but Google provides system images for testing purposes so that you can restore to any supported Android version for your Nexus device: – Wesley Wiser Aug 29 '13 at 19:30
@wawa The system images will try to upgrade again. – derobert Aug 29 '13 at 22:24

Go to this XDA-Developers thread and follow the instructions. You have to download an APK from there and install it as a system app.

[How-to] Disable OTA updates on Stock + Rooted ROMs - xda-developers

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Worked for me when trying to keep my Nexus 7 on 4.2.1 – pelms Sep 4 '13 at 19:11

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