Hello,
Hello, there are three reasons
1. The software signature is inconsistent. This situation usually occurs when updating software. For example, if you have installed an older version of a certain software before, and the signature of the software you need to update is inconsistent with the software you installed before, the application cannot be installed
2. The software is not signed. This situation usually occurs when you extracted the software from the ROM package or modified it yourself without re-signing it.
3. The system version required by the application is different from the version of your phone. For example, a certain mobile phone software requires the Android system to be Android 2.3 or above, but the Android system of your mobile phone is Android 2.2.
The application is not installed