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Here I have Xiaomi Redmi 4A and let me show you how to use an engineer mode on the following device
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So at the very beginning let's start by using a home screen
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Let's choose a phone icon in order to open the phone's dialer
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Let's activate keypad and let's use the following secret code. As you can see engineering mode just pops up
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Here you can accomplish some automatic test or just a single item test
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So let me choose single item test and now you can test all the features from the following list
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You can test for example the receiver and you have to choose either the test is success
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or fail. Let me choose success. Let's go back. You can also check the speaker
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Tap success. You can also test for example the camera, the front camera, the rear camera, the flight
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and other stuff. You may also test the FM, you have to insert the headset in order to do it and some other
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stuff such as blam, LED, vibration, battery, loopback, GPS and other stuff
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Let's go back and you can also see the test report right here and this is the report of
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the performed test. Let's go back. You may also choose the hardware version
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This is the software and the hardware version. You can read such things as MIUI version, software version, build finger, the phone
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serial number, email number and other stuff. Let's go back. You may also choose device view and read the full specification about your device. Excellent
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Now if you would like to go back and use your device let's use your back arrow a couple
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of times and now you are in the normal mode. You can use your phone
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