Phone [q] need help to re enable knox

so i recently towelrooted my att gs5 and superusersu asked to diable knox so i did, later i had some issues so i factory reset the phone. however it says knox 0x0 so it is not tripped. However it says in application manager that knox has 0.0 mb of data. i just want to re install, or re enable knox. can someone tell me hoe to do that or if its even possible. I thought that sense it was not tripped i should be able to still recover it so i can use private mode and art runtime. THANKS!