Originally Posted by moody69
There is a way back to 4.1.2. As said before, you should had used the search, but anyway..
The only way (until now) to downgrade is root your phone (bye bye knox warranty), install mobile odin and flash your 4.1.2 rom via mobile odin. Even doing this, you still will have knox bootloader, you cant get rid of knox.
Make sure you select the options to clean cache and data in mobile odin or i will get stuck on bootloop
Samsung Galaxy Ace - CyanogenMod 10.1.3 by androidARMv6
LG Optimus L9 P768 - LG stock 4.1.2, rooted, LOCKED bootloader
Samsung Galaxy SIII i9305T - Stock 4.3 Rooted, Wanam Xposed