How to fully unroot my alcatel pop d5

A

AC Question

Iunroot it using king root and super su but when im updating my firmware it's always warning me that i have a root !!!
But i already remove it and i delete also the SU
And i use the one click method(UNROOT) but it's not still work
Help me guys i need to unroot my phone to make update my firmware
ANY SOLUTION OF THIS PROBLEM???
 

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