Now Listen completely. I've got a Samsung tab s. I rooted it and at that time i had android v 4.1. I did a factory reset for some reasons then I thought my device was unrooted. Today I wanted ps4 remote play on my tab which only works on sony devices and on others if rooted. I saw on the net that factory reset doesn't remove root. But the ps4 remote play app needs at least android v 4.2. So I need to unroot. But when I install superuser or super su it gives su binary error. I need to do software update which which can't be done if rooted. So Summary: How to remove that su binary error.
Read more: Want to completely unroot phone using supersu