Here you've got HTC desire20 pro and let me show you how to activate installation of apps from unknown sources. So, first, just open the settings go, find and select absent notifications and here go to advanced. Now, click on special app access, scroll down, and now you will notice, install unknown, apps so smoothly market, and then you can pick the app that you would like to give this permission to click on all from the source and that's it from now on, you'll be able to install from the source, and you can pick it a big different app and also give the permission smoothly by tapping on all from the source. So just choose the application that you would like to give this permission to that. You would like to activate installation from and then just click on it, and that will be all thanks for watching. Please subscribe our channel and leave the thumbs up.
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Source : HardReset.Info