multi window note 2 help

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http://androidforums.com – Hey I just rooted my note 2 today and I was hoping it would give me android 4.1.2. Unfortunately it didnt but it did confirm that the root was done right. I want 4.1.2 so I can have multi window. Other than that I dont know much about rooting at all. I cant find a way to upgrade to 4.1.2 anywhere. I am with rogers and have the sgh-i317m version. Can soneone help me please?! (General)