nenda playstore search super user then download ambayo imendikwa chainfire kisha install na pekua ndani yake utaona full unroot. click hapo full unroot.
Kama ulitumia kingroot kuiroot iyo ..
open the installed KingUser and click on the settings at the top, den u will see remove root option, jst click on it nd wait as ur phone gets unrooted.. Afta which u can reboot (copied from nairaland)