iPad not activating after I reset.
I bought a used iPad Air 1 (A1475) cellular version but I was told by the shopkeeper that you can only use it in WiFi mode since he had removed or bypassed an Icloud account on it. the iPad was activated already having my Apple ID in it. my son kept using it for 2 years without a problem. one day I just thought of resetting it since my son had installed so many unwanted apps so instead of deleting one by one I just reset the pad. from now on its not activating instead giving an ACTIVATION ERROR telling me to update using iTunes or contact customer support. please help me out on this one. I don’t really know what to do.