I have a ZTE N290 ... I signed a package of Internet LIVE for it, and nothing has started giving a lot of problems in the system ... When I have open the WAP menu, it loads and goes back to the main screen when I try to open the menu MESSAGE, it appears written: "Unavailable". When I try to format the phone memory, writing appears: "Device Busy". And when I try to connect it via USB on my computer, appears: "The system is not ready" and can only plug it in, turning it off. Anyone know what I do?