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Different signatures, how can you cover different installation signatures and cover different installation methods?
1. Reason 1: There is an old version of app on the mobile phone, and the signatures of the old and new versions conflict.

Solution: After uninstalling the old version of the app, reinstall the app to be installed.

If you still can't install the old version after uninstalling, please check whether there are any application residual folders below, delete the corresponding folders and reinstall.

If it still can't be installed, please see reason 2 and solution 2.

Second, reason two: the application is not completely uninstalled.

The performance of this situation is that there is no app similar to the app you installed on your mobile phone (similarity here refers to a series of versions of your app development and beta), and you have deleted the relevant application folder. This situation is caused by incomplete application uninstallation. The solution is as follows:

Premise: the mobile phone needs to be connected to the computer through a data cable, and it is in the open state of file transfer and developer mode.

Download adb and aapt and configure them.

Download adb and aapt, and download the link (/download/learning _ lb/10320312).

After downloading, unzip the folder and configure it in the environment variable.