i have nexus 4 4.3 it's rooted and i used to do all read/write/delete on to my root dirctory wiht ES file now the when i try to do anything of that i ger faild/denied/you dont have permision, also rom mnager i cant delete any saved rom backup access denied,
On your su app do you have root access to prompt or grant change to prompt I had that problem. Also in the new version of es you have to go to tools- root explorer(make sure its on)- then click on the words root explorer to open the menu to mount it as writeable
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