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Here I have Samsung Galaxy J6 and let me show you how to use secret codes on the following device
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At the very beginning let's start by using your home screen. Let's open the phone's dialer and let's use the first secret code, so let me check out
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the firmware version of the device. Let's use this code, asterisk pound, 1, 2, 3, 4 pound and as you can see the version
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of the Samsung Galaxy just pops up, you can check out here AP, CP, CSC and Model
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Let's go back by using the back key, now it's time to open the test menu, so let's use this
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code, asterisk pound, 0, asterisk pound. As you can see the test menu just pops up, here you can test your hardware features
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for example your display, the red color, green, blue, you may test the receiver, vibrator
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and other stuff, just the camera, subkey, speaker for example and other stuff
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Let's go back to quit this menu, sometimes you need to press twice
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Now let's open here the service menu, so let's use asterisk pound, 0, 0, 1, 1 pound
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Service menu just pops up, here you can use the following information, you can also use
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more key to read the following options. Let's go back, let me quit the service menu, it's time to open the advanced service mode
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so you can use this code, asterisk pound, 2683662 pound
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As you can see this is advanced service menu, here you can also use more key to use the
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following options. Let's go back, it's time here to open the battery status, so let's use this code, asterisk
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pound, 0, 2, 2, 8 pound and battery status pops up, so you can read the battery specification
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right here. Let's go back and now it's time to open USB settings mode, so let's use asterisk pound
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0, 8, 0, 8 pound and USB settings pops up, you can change here USB mode, let's go back
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by using the back key and you can also open the advanced firmware version, let's just
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enter asterisk pound, 2663 pound and the firmware version menu just pops up, you can just read
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here a few information about your firmware and you can also check the email number by
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using the secret code, let's just use asterisk pound, 0, 6 pound and the email number and
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also the serial number pops up. What's more here you can also use the barcodes to your numbers
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