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Here I have Samsung Galaxy A7 2018 and let me show you how to use secret codes on the
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following device. So at the very beginning let's start by using the phone's dialer, let's activate the keypad
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and let's use the first secret code. So let's use the following
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Code asterisk pound, one, two, three, four, pound. As you can see the firmware version just pops up
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So here you can check out your AP, CP, CSC and your model
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Let's go back. Now it's time to open here the testing menu
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So let's use this code, asterisk pound, zero, asterisk pound. As you can see the following test mode just pops up
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Here we can navigate by tapping appropriate options and you can here test a couple of
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hardware features of this device. For example the display, red color, green, blue
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You may test the receiver. You may also here test vibration and other stuff such as for example the speaker
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And touch, front camera, sub key and a lot of more. Let's go back
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Use back key twice. Let me just make my screen brighter. And let's go next
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Let's open now the service mode. So let's use asterisk pound, zero, zero, one, one, pound
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As you can see service mode just pops up. Here you can read the following information
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You can also here use more key to use this menu. Let's go back to quit this mode
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And now it's time to open the advanced service mode. So let's use asterisk pound, two, six, eight, three, six, six, two, pound
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As you can see service mode just pops up. Here you can use more key and you can read the following information
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Let's go back. Now it's time to open the battery status mode
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So let's use asterisk pound, zero, two, two, eight, pound. And the battery status just pops up
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Here you can read the following information about your battery. If you would like to go back let's use the back key
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And now let's open the USB settings. So let's open this code, asterisk pound, zero, eight, zero, eight, pound
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And as you can see the USB mode, USB settings just pops up
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Here you can change your USB mode if you would like to
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Let's go back. And now let's use the following combination. Let's enter the advanced firmware version
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So you need to use asterisk pound, two, six, six, three, pound
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And as you can see here the advanced firmware version pops up
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Let's go back. And now at the end let me show you how to open the email mode
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Let's use asterisk pound, zero, six, pound. And as you can see the email and serial number just pops up
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Here you can just start using the following information. You can also use the barcode to this number
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Let's tap OK to close this. Let's go back and that's it. Everything went well
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