Samsung Mega 6.3 i9205 problem*does not have proper root*
I faced the same problem when I tried rooting A china phone having Samsung Galaxy S2 stock Rom. I searched and here is what I found Firstly Try installing binary through Busybox installer on play store. Interent is required to download and then try every version if It didn't work out for you. Then Download Kingoapp it's One Click rooting method. Kingoapp has successfully. In some cases it will ask you to install Costum recovery in order to root your device if it failed to root your device in the ordinary way so, if you don't want to lose your stock recovery just cancel rooting procedure.