Rooted Samsung Galaxy note 3. I rooted with towelroot, updated Samsung software, couldn't, the phone knows it's been modified. Tried to get rid of whatever is left in the system, and tried to use supersu to do it. Supersu says that there are no binary su. So installed supersu zip file to my sd card and I it came up with the following "E:footer is wrong E:signature vefication failed. What can I do please?