Phone MI4C, MIUI Global 8.0 Stable 184.108.40.206.0 (LXKCNDG), Android 5.1.1 LMY47V I am an absolute layperson and have bought the phone so in the xiaomi shop. I have never installed another version and do not know how to do that. I am also very satisfied and have only a small mistake. Perhaps the easy to fix. When I log in the phone, no messages and sounds come in. Only when I start whatsapp over the icon, it goes and remains synonymous. Is there a solution for this? I do not have the latest version of what I've got enough for me. I'm too old for that!