"Xbox One E200 Error"に関する回答I FIXED MINE WITHOUT SENDING IT AWAY YAY!!!!!!! Guys, i'm putting this in capitals because there is another fix rather than the offline diagnostic. do a full factory reset. it worked for me and when you sign into your account again, you have to download games again but it's better than sending it away for ages. :) i did this yesterday 20th june 2016.