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?