Why does the HUAWEI P9 phone display the “installation failed” message when I install certain apps in guest mode?

Reason: This may be because another user has already installed the app, and the version that has already been installed is newer than the version you are trying to install.

huawei p9 installation failed

Solution: It is recommended that you switch to owner mode, enter Settings > Apps, find the app, touch it to enter settings management, touch the menu at the bottom of the screen then select the “uninstall for all users” option, and then download and install the app again for the guest.

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