[Q] Root Messed

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http://forum.xda-developers.com – So, I have a vodafone smart 2 phone and I rooted it 3 weeks ago, it worked fine until today I made a factory reset of it. So after the reset, I wanted to open a root required app and nothing, it gave me a error, i installed another, and one more error. I updated the su binary and now I cannot even open the SuperUser App. But, when I instaled MiExplorer, I can acess and modify the files on the internal storage of the phone. P.S. After one or two days of the Root, I did a factory reset and it worked like a charm. so the problem must be another. Help me please and thanks in advance (HowTos)