Difference between adb uninstall and adb uninstall --user 0
--user specifies the user to run as, not the user its uninstalled from. 0 is root in Linux. You're telling it to run the uninstall command as root, which obviously has heightened privileges and can do it. A normal user doesn't and can't. The same applies for install.
Failure [INSTALL_FAILED_ALREADY_EXISTS] when I tried to update my application
If you install the application on your device via adb install
you should look for the reinstall option which should be -r
. So if you do adb install -r
you should be able to install without uninstalling before.
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