Downgrade Note 10.1 N8010 [4.4.2 --> 4.1.2 stock] topic

Hello!

Right now i'm using Gnabo ROM v6.5 and i decided to return to stock rom. How can I do this?
Just download the stock android 4.1.2 and flash via Odin (by inserting it to AP section)? I heard that this is more complicated process.

Thanks for help in advance :)