I have Lenovo K4 note , having Marshmellow installed. Now the problem is what happened, one folder having some files around 2 GB, I cant delete that folder neither the files, nor I cant CUT or Move . But yes I can rename that folder. I cant add or change the permissions too. The dafault permissions is given same as other folder and files. The phone is not rooted. CAn you please help on that. .