How am i gonna download this on my zte n800 when my phone is black saying Android going on in off

[AC Question]

My phone goes on in off you can't get pass the main screen

 

[B. Diddy]

Welcome to Android Central! Are you able to remove the battery? If so, try replacing it with a new or different battery. Otherwise, you probably have to bring it to a repair shop. It could be a firmware or a hardware problem.