Package Signatures Do Not Match The Previously Installed Version

Package signatures do not match the previously installed version

You need to uninstall it because you are using a different signature than the original. If it is not working it might be because it is still installed for another user on the device. To completely uninstall, go to Settings -> Apps -> HAgnostic News -> Options (the three dots on top right) -> Uninstall for all users

How to fix signatures do not match previously installed version error?

For people still facing this issue, yes this issue is still unresolvable to this date. At least I have found out why the issue happens, which is apparently because when I remove an app, Huawei asks whether I would also want to remove the app's data or not. I answer "no". And once you answer "no", you'll never be able to reinstall that app on that device ever again, because of the residue of the app data on your device. And I have tried my best to remove any residue by any means, I still cannot reinstall the app.

Only one cure works: reset factory settings. I did this and now I can reinstall the app. Of course, that means the data will be lost. But at least there's a Huawei backup app, so there's that.

INSTALL_FAILED_UPDATE_INCOMPATIBLE: Package signatures do not match the previously installed version; ignoring

I met the same error today.And I found thishttp://blog.bihe0832.com/android-v2-issue.html.It's in Chinese.The key points describe below:

After package your apk file, unzip it,check the file
META-INF/ANY-NAME.SF.I sign the apk with jarsigner command line
tool.I found that the alias putted after the jar-file when exec the
jarsigner, will used as the ANY-NAME.Then open the ANY-NAME.SF, if
you found a line of X-Android-APK-Signed: 2,That's the cause of the
error.Resign your apk,if the line of code gone, the apk will be
installed success.

Manually installing an updated APK fails with signatures do not match the previously installed version

Yes It is possible if somehow your old application is not removed 100% or its data is not removed.

Try:

adb uninstall "com.yourapp.yourapp"

If you don't know exactly what to put as replacement for "com.yourapp.yourapp", then you just open Android studio, Run your app while it is connected to a device and then look at Debug window.

It says:

 Waiting for device.
 Target device: samsung-sm_t531-xxxxxxxxx
 Uploading file
 local path: C:\Users\myapp\app\build\outputs\apk\myapp.apk
 remote path: /data/local/tmp/com.myapp.myapp
 Installing com.myapp.myapp
 DEVICE SHELL COMMAND: pm install -r "/data/local/tmp/com.myapp.myapp"
 pkg: /data/local/tmp/com.myapp.myapp
 Success

com.myapp.myapp in this case is the name of the package you must use to uninstall.

Cannot install newer version on android device

This means, that the two APKs are signed with different signing keys.
If you try to install a debug version, the APK is signed with a debug key. So it is normal that the installation will fail.

In order to test the update of your app, either create a release version of your app (e.g. by selecting "release" from the "Build variants" tab. Or add the signing release configurations to your debug build variant in the app module's build.gradle file.

Installation failed with message INSTALL_FAILED_UPDATE_INCOMPATIBLE: Package signatures do not match the previously installed version

There are two possibilities I can think of

1. You use Google Play App Signing. If you use Google Play App Signing then the signature in apps coming from Google Play will always be different to the app coming from your IDE. The only way you can get the update to work is to update the app from Google Play. The best way to do this during development is to use an "Internal test track". Google launched these at Google I/O this year and they let you update your app in seconds from Google Play. So when you have an update, don't install from your IDE, upload to Google Play internal test track, republish, and then update from Google Play. It is really quick.
2. You don't use Google Play App Signing, but you are trying to install your debug build instead of your release/production build. Make sure you are building the production release APK, so it is signed with the same key as the one uploaded to Google Play.

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