What Samsung 19200 downloaded cannot be opened, and the unknown source is ticked.

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

1. Download the installation attempt again.

2. If other third-party software can be used normally, only this software can't have compatibility problems with the mobile phone system.

3. The software can't be installed normally due to the lack of memory in the mobile phone. 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.

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.