After flashing the mobile phone with the upgrade package, the mobile phone is stuck in the upgrade interface.
The probable causes and solutions are as follows:
1. Large version upgrade takes a long time if the upgrade package is large.
2. Many applications are installed in the mobile phone before the upgrade, and the upgrade takes a long time.
3. Different mobile phones have different performance, so the upgrade duration is different. Please wait patiently for a while.
4. During the upgrade, do not press the Power key for a long time. If you press the Power key to restart the mobile phone forcibly, the mobile phone will enter the upgrade process again. It is recommended that you wait patiently for a period of time. If the upgrade process is too long (several hours), you cannot end the operation and try to restart the system forcibly and then perform the upgrade again.
5. If the problem cannot be solved, the user data can be forcibly upgraded via Recovery (which will cause loss of user data).
6. Go to the repair site for repair.
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