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Here I have Xiaomi Mi 4 and let me show you how to open hardware test mode on the following device
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At first let's start by using a phone's dialer so let me tap phone icon right here and let's
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input the following secret code. Star hash, star hash, 64, 66, 3, hash star, hash star
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As you can see the hardware test just pops up. If you perform some test in the past here you've got the result of them
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You may perform for example the check version info test. Here you've got some specification and some identification number of your device such
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as serial number, email number, build number, kernel version and other stuff
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Let me choose pass. You can perform some test above your sim card
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As you can see here you've got the results. You can change the result if you would like to perform some test again for example the vibration
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This time let me choose fail and as you can see the result has changed
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You can perform for example the display test, the red, green, blue light
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Excellent, let me go back. You can perform some LAN address, bluetooth scan, rear camera, front camera and other
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important features. So that's it. If you would like to use some more tests let's use more key and choose additional tools
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And for example here you've got NFC test tool, LAN test tool, bluetooth test tool, modem
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test tool and other stuff. If you would like to go back and close this window let's use your back arrow a couple
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of times and tap ok. Now you may use your device. Thank you for watching
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