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I have Blackview A20 and let me show you how to add the screen lock protection on the following device
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So, at the very beginning let's start here by using the home screen. Let's open the list of all applications, choose here settings, then scroll down and select
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security and location. So from the following menu let's choose here the screen lock
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As you can see here you can select pattern, pin or password
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In my case let me select pattern. Now let's choose your unlock pattern, in my case it could be the following one
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Tap next and let's do it twice just for confirmation. Alright this is your unlock pattern
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Now you need to select the form of notifications. You can select show all notification content
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You may also hide the sensitive one or don't show notifications at all
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In my case let me show all content and let's tap done
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Alright so now all you need to do is just simply press the power key
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And as you may notice if you would like to use your device you need to enter the pattern
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So let me do it. Excellent! Everything went well. Thank you for watching
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