I'm using last version of flutter and dart. First I installed my app from play store and after that I've attached my device(Samsung S8+ with android 9) for debugging, it's shown me this error:
Failure [INSTALL_FAILED_VERSION_DOWNGRADE]
After some searches I've done theses works:
uninstall from all user the currently installed copy
adb uninstall "Package name"
downgrade android:version from manifest.xml
and they haven't worked!
I realized my app version from app manager and I would edit version:
version: 3.8.0+62 -> version: 3.11.0+66
from pubspec.yaml, it's shown me this:
signatures do not match previously installed version; ignoring!
I think the previous apk is already installed but it doesn't exist in system App manager.
Other projects working fine.
What should I do?
Following the below steps did it for me. Hopefully this will help others.
On the terminal, run following commands (ensuring adb is on $PATH):
$ adb uninstall [package_name]
[package_name] here would be in the form com.domain.appname.
$ adb install -r -d [path_to_debug_apk]
-d allows version downgrade for debug builds.
-r is to replace existing application and may be redundant if the uninstall succeeded in completely purging previous installed copy. I was just a bit paranoid and used it.
See $ adb help for more details.
It is then possible to attach to this debug build from terminal using flutter attach, and get the debug log on terminal just like flutter run.
I believe now that it should be possible to execute flutter run too after the first uninstall step without errors.
I had a similar problem with flutter run while trying to debug an app while I had a release version of it installed on the device already.
I got an adb error stating:
Error: ADB exited with exit code 1
Performing Streamed Install
adb: failed to install /path_to_project/build/app/outputs/flutter-apk/app.apk:
Failure [INSTALL_FAILED_VERSION_DOWNGRADE]
Error launching application on [deviceName]
Like in your case, uninstalling the app from application manager on the phone did not remove this error.