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If you need to download applications and games to Samsung Galaxy A51 from the website or 3rd application store outside the Play Store, you need to activate the function of installing unknown applications on the device, if this function is not enabled, all applications or games from the above sources will not be able to install on your Samsung Galaxy A51 smartphone.

Android phones in general and Samsung Galaxy A51 phones in particular have security features that block users from installing APK files from outside. This is an extremely useful feature because it helps the phone not to be infected with malicious code from strange, unknown APK files. If you still want to install applications and games from these sources, you need to activate the Unknown Sources feature, also known as turning on unknown sources or installing unknown applications.

Turn On Unknown Sources On Samsung Galaxy A51

How to install unknown applications on Samsung A51

Step 1: First you access the Settings function on the Samsung Galaxy A51 phone you are using. Next, find and select Biometrics and security.

Step 2: Here you find the line Install unknown applications , click on it.

Step 3: If you want to install applications and games from any application outside the Play Store, you choose to go there. As the example here, 9Mobi.vn want to download and install apps from the Chrome browser.

Click on Chrome browser -> In the next window you proceed to activate the Allow function from this source by dragging the dot to the right . After successful on, the dot and horizontal bar will turn blue.

And now you can freely download and install your favorite applications and games to Samsung Galaxy A51 phone from many different sources without having to worry about the problem of the error that cannot install the application anymore.

Above is 9Mobi.vn guide to you on how to install unknown applications on Samsung A51. To know how to factory reset this device to its factory state, you can refer to how to Restore Samsung Galaxy A51 cup settings to do it.

https://Software/cach-cai-ung-dung-khong-xac-dinh-tren-samsung-a51-26288n.aspx
I wish you all success in following the above steps.