Help ! M5 note flashing firmware problem

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2017-03-28 23:50

Edited by User92078052 at 2017-03-28 21:23

I rooted my M5 note but Snapchat can't use on a rooted phone.So i used supersu to unroot the phone and factory reset my phone
but Snapchat still can't use on my phone so i download the 5.2.11.0G firmware to flash
problem is it said the update zip is too old but i downloaded a same version firmware with the phone
then i try to flash different versions of the China flyme 6 firmware, every firmware show "firmware corrupt"
Supersu said my phone not rooted but "Root permission" which is in setting show the phone rooted and Snapchat still can't use
What can i do now to unroot my phone completely ?