Xiaomi 4 lost a lot of information after the crash.

According to the situation you described, you can try the following:

1. Try to charge the phone with the line for a while, or replace it with a battery of the same model.

2. Take out the SIM card and SD card at the same time, and then try to turn it on.

3. If the problem still exists, it may be related to the third-party software you downloaded and installed yourself. Please press and hold the menu button (left touch-sensitive button) until the words "Safe Mode" appear in the lower left corner of the screen when you see the logo icon when you restart the computer. After uninstalling some downloaded applications in the settings, turn off the computer and restart it.

4. If you still can't boot after uninstalling the application, you can back up data (such as contacts, text messages, photos, etc. After entering the "Safe Mode" in the above way, the factory settings will be restored.

5. If you can't start your mobile phone in safe mode, I suggest you take the three-guarantee certificate of your mobile phone and go to the nearest service center for inspection and maintenance.