By default, Android does not allow installation of applications from unknown sources, like website or apks that you downloaded. In this guide, we help you enable the setting that allows installation of app from unknown sources.
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- Go to [Settings]>[More settings]>[Security].
- You will now see option to turn on ínstallation form unknown sources.
- Turn on/off [Unknown sources].
You can now install applications from unknown sources.
Even i follow the step there is no unknow sources