John is thinking about getting an Android tablet from ebay, but it doesn't have the latest version of Android on it.
To upgrade it, It depends on if he wants to "root" it and do it privately or if the manufacturer offers a regular update of Android operating systems. Most likely, John would need to root it. He recommends the Cyanogen mod, but it has to support the tablet John buys. It's not for the faint of heart, and because of the lack of support, Leo doesn't recommend that John do this.
For a little more money, he's better off getting the Google Nexus 7. That runs the latest version of Android, "JellyBean".