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Here I have Samsung Galaxy Note 8 and let me show you how to test this device
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So let me show you how to enter the hardware test mode and how to make sure that your device
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perform perfectly and it's 100% fine. So at the very beginning let's unlock the screen, let's open the phone's dialer, let's
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activate the keypad and let's use the secret code that enables you the Samsung test mode
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So let's use the following code, star, pound, 7, 3, 5, 3, pound
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As you can see the following test mode pops up, here you can navigate by tapping appropriate options
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So let's test the melody, vibration, speaker, dimming, camera
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And you may also test other things such as the front camera, bluetooth, dot mode, geord
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mode, accelerometer sensor, proximity sensor and light sensor. So let's go back by using the back arrow to quit this test mode and if you would like
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to test some more features on your device let's use in other testing menu
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So let's input the following code, star, pound, 0, star, pound. As you can see the following menu pops up, here also you can navigate by tapping appropriate
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options and here you can for example test the colors of the screen, the red, green
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blue, receiver, vibration, you may also test the speaker and other stuff such as the LED
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black, the S-Pen, the subkey, sensors, front camera, barcodes and other stuff as well
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So let's go back by using the back arrow to quit this test mode. So let's use back arrow a couple of times and now you can use your device in a normal mode
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So that's it, here you have some tricks to test your device
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