unroot S5 no binary supersu

[kawjumper201]

I have an att S5 with 4.2.2. I bought used and didn't know it was rooted so I downloaded super su to unroot but it didn't fully unroot. Now I try to get into super su and it says no binary installed etc. All I want to do is to get rid of the root completely. I came from apple and don't know much about androids and don't want to brick my new phone trying things out. Thanks for your help sorry if this has been covered I couldn't find a fix.

 

[kawjumper201]

Is there a way to root my phone again then get supersu running with binaries and then unroot? Or is there a way to download binaries into supersu? Thanks again.