Sometimes, you may want to install non official applications on Android. For example, if you want to root your phone with an application, there a big chance the application will be labelled as “unknown source”. Android won’t let you install this application, unless you allow installation from unknown sources.
Allow applications installation from unknown sources on your device
There is an easy way to do this, simply follow these steps:
Open your settings.
Go into the more tab located at the top right and press on Security.
Press on the Unknown sources button.
And that’s all what you need to do in order to install unknown sources applications!