Long press the power button for 10 seconds until the phone automatically turns off and the screen turns black. At this time, the phone has been forced to turn off successfully and will restart immediately.
首先在我们的屏幕已经无法进行任何操作的时候，其实你还能使用实体键。一般我们的手机机身会有三个实体键，其中 2 个的音量键，1 个是电源键。一般音量键在机身左侧，电源键为了方便使用，一般在机身右侧。使用电源键关机的方式有 2 种。
First of all, you can still use entity keys when we can’t do anything on our screen. Generally, our mobile phone body will have three entity keys, two of which are volume key and one is power key. Generally, the volume key is on the left side of the fuselage, and the power key is on the right side of the fuselage for convenience. There are two ways to use the power button to shut down.
The first one is the first one
长按手机电源键 3 秒，此时手机会出现新界面，此时松开电源键，点击其中的“重启”即可。
Long press the power button for 3 seconds, and a new interface will appear. Release the power button and click “restart”.
Sometimes, the first shutdown doesn’t work. At this time, you can use the second shutdown operation, which is forced shutdown.
长按电源键 10 秒，直到手机自动关机，屏幕黑屏即可松开电源键。
Press and hold the power button for 10 seconds until the phone turns off automatically and the screen turns black.
Wait for a period of time, and then click the power button to start, the boot steps are the same. The above two methods are very effective, basically can solve the problem.
But when you need to use the forced shutdown, it means that your mobile phone has a small problem, which may cause some data loss after the forced shutdown. It is best to do a good job of data backup at ordinary times to ensure that the important content is not lost. If lost, you can also use professional third-party software to retrieve data.
If there is still a crash problem after restart, it is recommended to restore the phone to factory settings after backing up important data. If the mobile phone cannot be operated after the crash, it is recommended to upgrade the mobile phone. After the upgrade, the data stored in the phone will be deleted.
Note: if the problem still exists, it is recommended to contact customer service or take the purchase invoice to the local Huawei authorized after-sales service network for maintenance.