Default [Q] How to delete su-binary? (lost root)

I root my phone using vroot and got a chinese kinguser, the problem is that I used a method to replace the kinguser and push
a new su-binary and busybox i think and after reboot the kinguser is gone and no supersu was replaced, I have tried installing a new
Supersu kinguser superssu but nothing works just got a message that D su-binary must be updated. Also tried flashing zips for rooting in stock
Recovery and tried many methods for unrooting but nothing works. I just wan t a suggestion how to delete the su in /system/xbin. TIA