I have bought a Xaomi Mi4S recently. So far I found it useless. if I am lucky, I can make a phone call or receive a call. I have left uncharged a few times, so that the battery is completely empty. After that, I restart and it works fine for a few days. Then I get some messages in Chinese, so that does not help a lot... From then on, it becomes very slow, heats up and drains the battery. After a full load, overnight, the battery is empty in 4 to 6 hours, while in standby mode, not a single action performed on the phone. It looks like some APP is draining performance and battery.
I did run some app to check battery, removed several app's but the problem remains.
Can someone give me a hint on how to solve this?
Yesterday, I managed to do a factory reset. Then reconfigured from scratch. In the last 10 hours, battery consumption is 2% (standby), very acceptable. At this time, speed is ok. If it stays this way, I am very happy.
Before this reset, the phone was set for sync with Mi-Cloud and with Google. I think something locked up during this sync process. I guess the messages in Chinese characters were error reports from Mi-Cloud sync.
Now deactivated sync with Mi-Cloud and kept sync with Google.
I am not sure if I want to do that. I bought a brand new phone, and apparently it is contaminated. If it does not work as expected, I will dump it and buy something else..
I am not a computer specialist, just a frustrated user.
It is easy said to change the rom. How do I do it? I read instructions like 'unlock bootloader', ask for a code. When asking I get some Chinese menu's..
I feel very very uneasy about this hole story.