According to your description, I suggest you try the following methods:

1. Download the installation attempt again.

2. Due to the lack of memory in the mobile phone, the software cannot be installed normally. It is recommended that you move the multimedia files stored in your mobile phone to an external SD card to expand the memory space of your mobile phone, and then try to install it.

3. Unknown source is not open: Set the-Security-Unknown source check box, and then try to reinstall;

4. Update the mobile phone system version and then try to install it.

5. Back up mobile phone data (phone book, SMS, multimedia files, etc.). ), check the unknown source again after restoring the factory settings, and then try to reinstall.

If the problem still exists, please send the phone to the nearest Samsung service center for testing and further processing. Please visit:

Samsung knows to provide you with high-quality solutions and answer your questions attentively, hoping to get your satisfactory evaluation.