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Here I have Xiaomi Mi A2 and let me show you how to enter QMMMI mode on the following device
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So at the very beginning let's start by pressing the power key, let's tap power off and wait
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until your device will be completely switched off. Then let's use the following combination of keys, power key, volume down and volume up
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So let's hold on together those three keys for a couple of seconds, keep holding those
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three keys, release them as soon as Android One logo pops up on the screen and now we
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need to wait a few seconds. That's it, now let's unlock the screen and after a few seconds the following mode should
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pop up, QMMMI. So here you can perform some hardware test, you can check out for example the system info
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If the system is correct let's tap pass. You can check the sim card, vibrator, LED light, for example let me test the vibrator
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let's tap pass if everything is correct. You can test the WiFi, Bluetooth, GPS, battery, light sensor, fingerprint, for example let
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me test the light sensor. And you can also tap run all to run all tests, you can use more key in order to refresh all
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tests and to for example tap settings. You can also choose reset here to reset all the tests or you can tap reboot to reboot
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to QMMMI to shut down the shift mode or to reboot to Android simply
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If you would like to quit this mode you can also use back key and now you can use your
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device, here you can shut down the QMMMI mode and that's it, everything went well
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