1. Forgot to upgrade the application. After applying the update, I forgot to upgrade the version of the application, which may also be the reason for the flashback.
2. The application contains a virus, and it is also possible that the application has been infected with a "virus" and blocked by the mobile phone security software, so that the application software cannot be opened or flashed back.
3. Various applications are incompatible. Now, due to the different software and hardware forms of mobile phones, some applications require system versions, especially some applications require higher resolution of mobile phones, so if they are incompatible with the system versions and resolutions of mobile phones, flashback is inevitable.