Lollipop 5.0.2 on new at&t One m8 , show all sd card options DISABLED, help please!!!

Hi I bought a new AT&t -Unlocked One m8 with lollipop 5.0.2 already installed, in fact o blught 2 of them, one perfectly reads sd cards, allow to use storage, while the other don t even hace sd card option enabled ( every storage options bu internal storage es DISABLED and don t know how can i enable it since i don t have any visible option to do it! Please if someone can help me Ill be more than thanked!!!!!!!