1. Yes it's knox free
2. Flash mj5 bootloader, yes you can downgrade to 4.1.2, install philz 5.15. Read the opening page throughly.
Sent from my GT-N7100 using XDA Premium 4 mobile app
1. YES KNOX FREE
2. Yes u will be able to downgrade. ...
Any update on 3g in call?
It is still broken :(
Happens with me too. When too many processes are running in the background, it sort of lags sometimes. Also it has crashed on me twice till now. Not much but just putting it here. You can try clearing the cache and see if that helps in any way!