Well, if you’re one of those people who would like to keep root access more than update your tablet, you’re in luck. The folks over at Gizmodo have come up with a solution to the problem: by using an app from the Android Market called DroidWall.
All you have to do is install the app on your tablet, set the mode to White list, and manually select which apps to give WiFi access to. In this case, you can give access to your email, browser, Netflix, Amazon Video on Demand etc. Hit apply, and that’s it. You should be able to re-enable WiFi and not receive automatic updates from Amazon anymore.