Problems finding "Android 1.0"

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http://androidforums.com – So I'm following zedomax's guide on rooting my Nexus 10 for Windows. I'm a complete noob at this, which is what I'm guessing you get a lot of. First, some info. It's Ver. 4.2.2, and the Build Number is JDQ39. Also, I've used it before, and I'm doing this all on Windows 7. I was following a different tutorial that ended up not making any sense, but I had gotten to the point of getting developer options open under system, and enabling USB debugging. I realize that this step isn't at the beginning of zedomax's guide. So, I decided to disable USB debugging. So, I follow the video, but when he g (General)