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The first step is to turn on the phone and find the settings.

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Step 2, open the settings.

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Step 3: After entering the phone settings page, you will see multiple options. Drag the page up and down to find and click the security and privacy options in the list.

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Step 4: Click more security settings after entering this page.

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Step 5: After entering this page, you can see the unknown source application download and external application source installation in the list. Click the two sliders at the positions shown in the figure to turn off these two functions.

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Step 6: After the function is turned off, it will be displayed as an icon, and the setting will be successful.

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