Samsung Galaxy s4 not allowing update

[AC Question]

I received a used s4 as a gift a few months ago and it turned out that it had been rooted. It wan't until recently that i decided to unroot it by using the SuperSU one-click unroot button. It did it's thing, I uninstalled it and restarted my phone. I expected to be able to update my phone now but whenever i go click "Software Update" nothing happens at all, like before! This is really frustrating to me, please help!

 

[NoNexus]

If they rooted, they may have removed some of the software that is preinstalled. That will cause an update to fail. You can try a factory reset and if that does not solve the issue, you will have to flash a stock ROM.

Check XDA for the details.

 

[lolofthedead]

I can't do a factory reset it always says something like "could not do normal boot...Odin mode" what can i do for that?