Support problems after rooting..

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http://androidforums.com – Hello..I'm new to android and this is my first android phone the note 2. After just 20 days I decided to root my phone and I rooted it with cwm on ubuntu linux. As I'm a newbie I didnt know I wont be able to update my phone after rooting. So I googled it and found about stock recovery and I did it through cwm recovery. The problem now is that after getting to 4.1.2 I cant boot back into cwm recovery and all files that need root say "no proper root access" . The superSU says failed to update binary. The learning hub app that comes pre installed says that rooting is detected...I dont (General)