Thank you for your post.
I am going to follow it step by step as I have currently N7100 with netowrk issue as my knox is 1 at 4.4.2.
I want to go back to 4.1.2 so I can use my phone again with less complications and better battery life.
One more question about the process?
Will that downgrade will fix the network issue I am facing. As currently my phone can go on wi-fi but cant make calls or send sms. Coverage is not there and it shows emergency calls only.
Please clarify. Currently downloading all the software listed by you and will try to follow the process once response from you received.