We've got a poor, a 91, and let me show you how to activate installation of apps from unknown sources on the following device. So at first you have to open the settings then find and select device and privacy go a bit lower and here under app installation you will find unknown source installation just clicking once and now can give permission for some particular application. Let me choose, for example, phone manager and then tap here to arrow. You can do the same for from Google Drive, and this is how you can allow installing and install some apps from those sources. So this is it that will be all just pick. The application that you would like to give this permission to market make the indicator active and up.
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Source : HardReset.Info