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Here I've got Xiaomi Mi Mix 3 and let me show you how to enable and use test mode on the
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following device. So at first you have to open the settings. Now click on About Phone, scroll down a bit and select Carnet version
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Just keep tapping on it for about 5 or 7 times. And now we are in test menu
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As you can see you can perform various of very important and useful tests in this mode
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So for example you can test your fingerprint sensor, your front camera, back camera, OTG
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connection, light sensor, also the Wi-Fi scan, Wi-Fi address, Bluetooth. You can also get Bluetooth address
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You can check mic options, speaker, receiver, display, touch sensor, vibration, keyboard
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test and all the other very important and very useful tests. So let me pick for example keyboard test
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And as you can see Carnet keyboards power, volume up, volume down. So let me click on them
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And they all passed so they are working correctly. Select the vibration mode, so it passed
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This one passed. And now you can also check the black light
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Then battery light, white. And it's all working. So let me go back
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As you can see here with the solution maybe let's also check the speaker
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8, 4, 8, 4. So it passed the test. So let's make a noise on the mic after you plug in the headset
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Listen to the headset for a sound but we will not do it now so let me go back
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So you can check the light, the slider hole, OTG, charger and the camera, all the others
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So as you can see it's pretty easy to perform those tests but it's very useful once you
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have doubts if it's the application that is not working correctly or your phone
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So that's it. This is how you can enable this mode. You can confirm that you would like to exceed it because all the related text data will
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be erased. Tap on OK. And now you can start using your device as usually
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So that's it. Now you can test your device whenever you need to. Thank you for watching
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