The factory version of the mobile phone is EMUI 4.0 platform or above, and some of them are upgraded to EMUI 4.0 platform. For the sake of security and performance, it is not supported to install the application on the MicroSD card, nor to move the application installed in the internal memory to the MicroSD card.
Applications that have been installed on the MicroSD card before upgrading will not be affected after upgrading. If the application is uninstalled and reloaded after the upgrade, it will no longer support the installation to the MicroSD card.