How do I update my rooted 4.1.2 Samsung Galaxy Note 2 version to the latest version

[AC Question]

I'm having trouble to update my 4.1.2 Note 2 to the latest version. I have do everything but non of it couldn't worked. Because of the 4.1.2 version, My phone got limited to access the higher version apps to update such as Wanam Xposed, OTA update... And I couldn't even update by Samsung Kies. I'm even unrooted my phone to try but it's seem hopless now. Is there really a way to update my phone? Thank you