The problem can come from an apk if an apk is not the originall one, if it has been modified the signature verification will fail you from installing it. Or when you try to install an apk with older version than the installed one, the installation will also maybe fail.
Quoted from XDA developers:
"If you obtain an APK from outside of the Google Play Store and attempt to install it as an update to your currently installed app (read: same package name), the OS will attempt to validate the application’s certificate to make sure that it came from the same initial developers. If the certificate matches, the application install will
proceed as planned, your application will retain its existing data, and all is gravy. If the signature is not valid (indicating that the APK has been tampered) or if the certificate does not match that of the original app, the installation will fail."
Now here is an easy way to "force" the app / apk to be able to installed in our Android device.
Requirements:
- Rooted
- Lucky Patcher.apk app.
Step to solve "application not installed" caused by signature verification problem
• FIRST OPTION (if you already install Xposed)
This first way is more safe / reduce the brick chance of our Android device system, but it is required the Xposed installed. You must already Install the Xposed Framework, then activate the "Lucky Patcher +" module in xposed.
- Open Lucky Patcher.
- Tap on "Toolbox" -> "Xposed settings".
- Check the "Disable .apk signature verification" and "Disable signature verification in the package manager".
- Apply changes, done.
• SECOND OPTION (do some patch to our Android device system)
- Open Lucky Pather.
- Tap on "Toolbox" -> "Patch to android".
- Check the "Disable .apk signature verification", then apply changes. After this maybe your smartphone will reboot automatically, if not continue to next step.
- Still in the Patch to Android, then check the "Disable signature verification in the package manager", Apply changes, done (May reboot automatically).
If after doing this the application or game still gave same result: "App not installed", then the problem maybe not caused by the apk signature, maybe the apk is corrupt either not supported in your Android smartphone device.
Good reader make a good comment! If there is a mistake or broken link, please add a comment...