Are you using one of the Root toolkits (i.e. Wugs or the other)? Is your phone rooted? Or is this just via the phone?
Also, you _might_ want to look further into what a full 4.2.1 rom has to offer. I haven't seen anything that I like about 4.2.1 besides the camera which I was able to add to my rooted VZW Gnex running a 4.1.2 rom.
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