The Android system shows that the application is not installed. Solution:

Inconsistent software signatures generally occur when updating and upgrading software. The signatures of the updated software and the installed software are inconsistent, resulting in the application Unable to install. The solution is to uninstall the installed software first and then install the updated software.

The software is not signed. It is generally software extracted from the ROM package or software that has been modified and repackaged without being re-signed.

The solution is to use signature software to sign and then install it. The system version required to run the application is higher than the system version of the phone. If the software requires running on the Android system Android 4.0 or above, and the mobile phone system version is Android 2.0, the application will not be installed.

The solution is to upgrade the mobile phone system or download a software version whose system version is compatible with the mobile phone system.

The answer is not easy, I hope it can help you. If you are satisfied, please help to adopt it, thank you!