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