I installed root through framaroot and installed SuperSU so the files are in "system/apps" and then I factory reset days later. But it appears that it's still rooted and SuperSU.apk is still in the apps folder. I tried unrooting by deleting the SuperSU.apk from apps folder but the file manger states it cannot be deleted. I don't know what to do now. I tried unrooting with Superuser's selections and framaroot but to no avail.