Just want to share. I have a rooted and custom fw samsung s4 4.4 jelly bean and the software status is CUSTOM so i cant update. Also knox=1 so ive read in many forums that you need to reset the counter of knox so you can go back to official rom and update the system.
I tried deleting data/dalvik/system and reboot after, so there is NO OS. I downloaded odin for pc and samsung drivers for pc and the samsung s4 official lollipop here [Hidden Content]
Then followed instruction also in that site how to flash via odin and poop it become coco crunch! My software status is official and i updated the system 2x successfully.
I just thought that going back to official fw status and system update is impossible when the system knox is =1. So now i can play in fb messenger words with friends LOL