Finding the Solution for "App not installed. An existing package by the same name with a conflicting signature is already installed"

The problems of “App not installed. An existing package by the same name with a conflicting signature is already installed” can be annoying. Fortunately, there are solutions for it.

In installing some apps, you may face some notifications, and “App not installed. An existing package by the same name with a conflicting signature is already installed” is one of them. This notification indicates you have failed to install the app and there is problem with the package of apps that you are going to install.

There are surely many kinds of the app not installed error. The notification above is only one of examples. Because of the installation failure, notification will appear and the app will not be able to work. In this case, there are some solutions to choose.

App not installed error

Basic and Conventional Method


The problem is on the app you are going to install. Although it may be modified app, it is possible to have the same package. Therefore, the notification of “App not installed. An existing package by the same name with a conflicting signature is already installed” appears in your device. For this problem, there is basic solution.

In order to solve it, you can easily uninstall the app and other related apps. In case you still need it, just download the app from PlayStore. However, you will not be able to have multi-account anymore.

The Additional Methods


The basic method is easy to do. It is like removing the problems. However, it makes you unable to have the modified feature. It may be possible to reinstall the app, but it will not be similar to as what you may expect. That's why there is alternative method to solve the “App not installed. An existing package by the same name with a conflicting signature is already installed”.

1. Give permission for app installation

When you use Android, there are third-party sources, and you are not able to install these apps by default. So, you need to give permission. Let's check these steps.
  • Open the menu of Setting in your device. 
    Image Source: android-fix.com
  • Go to the submenu of Privacy
    Image Source: android-fix.com
  • Check Unknown Source and it will activate the feature. By doing this, you give permission for the device to install the apps from third-party source. 
    Image Source: android-fix.com
  • Click OK, if any question. 
    Image Source: android-fix.com
  • Back to folder location .apk file and install the app.
2. Using ADB

The second option is by using ADB. This is not easy way and you will go to the Recovery Mode of your device. This requires meticulousness in following the details, so you have to be careful.

Before starting, you need to install an app in your PC. It is called Android Debug Bridge or ADB. Then, you can go to the Developer Options in your smartphone. In this menu, you should activate the USB Debugging. After doing the preparation, enter the Recovery Mode. Well, it is easy since you only need to press + and power button at the same time.

By doing this, your device is in the recovery mode and connected to your PC in ADB app. Then, you only need to access the command prompt in PC. In the command prompt, you can type the command: adb install -1 –r and followed by the name of app to install.
adb install -l -r name-of-file.apk

3. Modify the app

The third process requires you to have root access. It will give complete access to the device and its operating system. However, it will make you lose the warranty of product since you change the factory configuration.

Image Source: android-fix.com
To modify the app, you must install ZipSigner. Later, you can open the app and the next steps are only to find the app and let it to do the rest. This will be quite complicated, so it is better to have someone to help you.

Image Source: android-fix.com
Those are some options of solution to solve problems. The alternative steps are quite complicated and quite risky since the wrong steps will make worse errors. Therefore, it is necessary to be careful in following the solutions for “App not installed. An existing package by the same name with a conflicting signature is already installed”.

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