1, check whether the "unknown source" setting is turned on.

2. Check whether the downloaded software format is supported by the machine. The software format supported by Android phones is. APK format.

3. Please read the software details when downloading the software to see if there are any requirements for the machine operating system.

4. If you still can't install the software/game, it may be because the software version is low or the software version has compatibility problems with the system. It is recommended to download a new version and try to install it.

5. If it is invalid, back up the data (contacts, information, photos, etc.) in the mobile phone and try to restore the factory settings. If the problem still exists, please bring the purchase invoice, repair card and machine to the Samsung service center, and the professional after-sales engineer will help you test it.