I have noticed that this device runs a spin-off version of android 5 but has a lot of things disabled. How can I enable developer mode on the phone. It is a flip phone running a android os but you can not seems to enable the developer mode by the usual method. It also does not seem to have the full version of android but somebody had told me possibly Cintrine OS since it is a ZTE. What file extension does this thing use? Is it even possible to install apps and the full android OS on it?