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Here I have Xiaomi Redmi S2 and let me show you how to enter the test mode on the following device
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So at the very beginning let's start by using your home screen, then you need to find and
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select the phone's dialer, let's activate the keypad and let's use the following secret code
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Asterix hash, asterix hash, 64663, hash asterix, hash asterix
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As you can see the QC test mode pops up, here you can test a couple of things, for example
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the software version, so if this is your software version let's tap OK, let's choose OK right
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here, you can also test the sim card test right here, if everything is alright let's
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tap OK, if not let's choose error and as you can see in if you tap error you've got here
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the results. You can also test the color for example, all colors of your display, the green, blue, white
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grey, black and other stuff as well
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Let me go back, let me quit this color test, you can also test the receiver, so you need
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to press the appropriate buttons, alright, you can test the WiFi, Bluetooth, LED, FM
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the OTG test and a lot of more. You can also use more keys and choose here WiFi test tool for example
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So that's it, let's go back, tap OK to clear the test and everything went well, thank you
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