I'm sorry for the inconvenience.

This prompt appears because the installation package you downloaded and upgraded is inconsistent with the application signing certificate attached to the system. When the system detects that the digital certificate of the application you are about to install is different from the application you have already installed, it will refuse to install.

This prompt appears when upgrading file management. It may be that the version you need to upgrade is not compatible with your device. I suggest you use your own version or wait for the update of the matching version. Please forgive me.

If you need other help, please feel free to contact us or visit Lenovo Lewen Bar () for consultation.