I have been facing a lot of problems with my note 2 on v4.3. Very quick battery drain, high RAM usage, Wi-Fi gets disconnected every 2 minutes even though the Signal strength is maximum, and a few others which aren't worth mentioning.

Due to these reasons i would like to switch back to 4.1.2. How do i do that? I heard that there is an additional knox security installed that voids warranty if I do so. How does samsung release such a useless rom and then make it ir-reversible. We haven't purchased these expensive phones just to experiment and throw it away if it doesn't work.

Well maybe someone here can help. Thanks in advance.