QMMI Xiaomi: hidden program for diagnostics and testing of the device

If you have ever looked into the engineering menu of the Xiaomi smartphone, you could stumble upon a mysterious program with the name of the smartphone. QMMI. It's not a desktop label, it's not mentioned in the official instructions, but it's a key tool in diagnosing and configuring the hardware of the device, what is it, what does the average user need it for, and how to use it properly without risking damage to the phone?

In this article, we will explain in detail what is QMMI (Qualcomm Manufacturing Mode Interface, what functions it performs on Xiaomi, Redmi and smartphones POCO You'll also learn how to securely access this tool, what tests can be done, and what hidden opportunities are available to power users when working with it. QMMI.

What is it? QMMI Why you need it in Xiaomi

QMMI (Qualcomm Manufacturing Mode Interface is a utility program built into the firmware of Qualcomm-based smartphones:

• 🔧 Testing of hardware components (display, cameras, speakers, microphones, sensors, etc.) during the production and repair phase.
• 📊 Diagnostics of malfunctions – allows you to identify problems with iron that are not visible in standard settings.
• 🔄 Calibration of sensors (accelerometer, gyroscope, compass) after replacement of modules.
• 🔐 Unlock hidden functions (for example, enabling debugging by USB bypassing standard restrictions).

It is important to understand that QMMI — It's not user software, it's a tool for engineers, service centers and developers, but some of its features can be useful to ordinary Xiaomi owners if they know how to use them:

• 🔍 Check the actual state of the battery (voltage, temperature, wear and tear).
• 🎤 Test microphones and speakers for distortion.
• 📱 Find out detailed information about the display (panel model, serial number, number of broken pixels).

⚠️ Attention: Some tests in QMMI This can cause system failure or even physical damage to components (e.g., if sensors are calibrated incorrectly). Use the program only if you understand what each menu item is responsible for.

What devices Xiaomi has on QMMI

Programme QMMI It is available exclusively on Xiaomi smartphones with Qualcomm processors, which means that on devices with MediaTek chips (for example, the Redmi Note 11 or the Redmi Note). POCO M4 Pro) it is not - a similar tool is used instead MTK Engineer Mode.

Here is a list of popular Xiaomi models where you can find them. QMMI:

To find out exactly which processor is installed on your device, go to Settings. → The phone. → Full specification → CPU model. If it says Snapdragon (like Snapdragon 8 Gen 2), it means QMMI There's one on your smartphone.

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If your Xiaomi is not QMMI, But you need to test the hardware, try alternative apps from Google Play, like Phone Doctor Plus or TestM. They are less functional, but safer for beginners.

How to open QMMI on Xiaomi: step-by-step instructions

Access to QMMI It is hidden from ordinary users, but it can be activated in two ways: USSD Or using the Engineer Mode. Let's look at both.

Method 1: Through code #4636##

This is the easiest method, but it does not work on all firmware. MIUI:

1. Open the Phone app.
2. Enter the combination: ##4636###.
3. If the code works, you will see the Testing menu.
4. Select a point. QMMI Test or Qualcomm Test.

Method 2: Engineering Mode (Engineer Mode)

If the first method didn’t work, try this one:

1. Enter the code in the phone app: ##4636##.
2. If the Testing menu opens, select Engineer Mode (or Engineering Menu).
3. In the engineering menu, find the Hardware Testing section.
4. There's got to be a point. QMMI Test or Qualcomm Test Mode.

⚠️ Attention: On some firmware MIUI (especially global access QMMI It can be blocked. In this case, only unlocking the bootloader and installing custom firmware with support for engineering functions will help.

QMMI's core functions: what can be tested

Interface. QMMI It's divided into several tabs, each one of which is responsible for testing specific components:

1. Display Test (Display Test)

It allows you to check the screen for broken pixels, color reproduction and sensor sensitivity.

• 🎨 Enable monochrome screensavers (red, green, blue, black, white) to search for broken pixels.
• 🖥️ Check multi-touch (simultaneous touch at multiple points).
• 📏 Find out the real screen resolution and refresh rate.

2. Battery Info (Battery Info)

One of the most popular sections, showing:

• 🔋 Real level of charge (%, mV and mAh).
• 🌡️ Battery temperature (normal: 25–40)°C).
• 🔄 Number of charging cycles (the more, the stronger the wear).
• ⚡ Charging/discharge current (useful for checking fast charging).

3. Camera diagnostics (Camera Test)

Allows you to test all camera modules (main, wide-angle, telephoto, front) for the subject:

• 📸 Autofocus correctness.
• 🔦 Stabilization activities (OIS/EIS).
• 🎥 Video quality (artifact check).

4. Sound testing (Audio Test)

This section may include:

• 🔊 Check the speakers for distortion (replaying test frequencies).
• 🎤 Test microphones (recording and playing voice).
• 🎧 Ensure the availability of the 3.5 mm connector (if any).

5. Sensor Test (Sensor Test)

QMMI It allows you to calibrate and test:

• 🧭 Compass (checking the accuracy of the determination of the light-points).
• 📱 Gyroscope and accelerometer (important for games and AR-applications).
• 🌡️ Approximate and illumination sensor.

Hidden opportunities QMMI: What is the program like beyond testing

In addition to standard diagnostics, QMMI Allows you to perform activities that are not available in normal operation MIUI:

1. Unlock hidden network settings

The Network section can include:

• 📶 Manually select frequencies 4G/5G (useful in areas with poor coverage).
• 🔄 Forced switching between 2G/3G/4G/5G.
• 📡 View detailed information about nearby towers (signal level, PCI, Band).

Sensor calibration

If sensors (such as a gyroscope or compass) are not working properly, they can be recalibrated:

1. Come to the Sensor Test.
2. You pick the problem sensor.
3. Follow the instructions on the screen (usually you need to spin the phone in different planes).

3. Incorporation of debugging by USB unlockless OEM

On some firmware MIUI activate USB Debugging is right through QMMI, Even if the option is locked in the developer's settings:

1. Open the Miscellaneous section.
2. Find a point. USB Debugging.
3. Activate the switch.

⚠️ Note: Change network settings or calibrate sensors through QMMI For example, an incorrect calibration of the gyroscope will cause problems with the autorotation of the screen, and manual change of network frequencies will cause loss of connection.

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QMMI — It's a powerful tool, but most of its features are for professionals. Don't change the settings that you don't know what they're supposed to do to keep your phone out of order.

Risks and Warnings When Working with QMMI

Despite the utility, QMMI — It's a tool that can harm the device if it's used carelessly:

Damage to hardware components

Some tests (e.g., checking speakers at maximum volume or calibrating sensors) may result in:

• 🔊 Burnout speaker with a long test at high frequencies.
• 📱 Sensor failures with incorrect calibration.
• 🔋 Accelerated battery wear with frequent discharge/charging cycles in test mode.

2. Programmatic failures

Changing hidden parameters (e.g. network settings or processor frequencies) can cause:

• 📵 Loss of mobile communications.
• 🔄 Rounding the phone on the boot (bootloop).
• 🚫 Blocking certain functions (for example, NFC or wifi).

3. Loss of guarantee

If the service center finds that the phone problem is due to changes in the QMMI, The guarantee can be cancelled, especially if:

• 🔧 Self-replacement of components (e.g. battery or camera) without calibration.
• 📱 Changes in changes IMEI or serial numbers of modules.

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Before use QMMI Reset to factory settings through Settings → The phone. → Resetting settings. This will help to avoid conflicts with user data.

Alternatives QMMI for diagnostics Xiaomi

If you don’t want to take risks working with QMMI, Or you have a smartphone on MediaTek, you can use alternative diagnostic methods:

1. Standard engineering menu (#4636##)

Allows:

• 📊 View information about the battery.
• 📶 Testing network coverage.
• 📱 Check the use of RAM and ROM.

2.Apps from Google Play

Popular Diagnostics Utility:

• 🔧 CPU-Z — iron-detail.
• 📱 Phone Doctor Plus – tests of display, cameras, sensors.
• 🔋 AccuBattery – monitoring the status of the battery.
• 📡 Network Cell Info Lite – Mobile Network Analysis.

3. ADB-Teams (for experienced users)

Through ADB (Android Debug Bridge can be accessed with many hidden features QMMI. Examples of teams:

adb shell dumpsys battery # Battery information


adb shell dumpsys sensor list of all sensors




adb shell am start -n com.android.settings/.DevelopmentSettings # Quick access to developer settings

FAQ: Frequent QMMI questions on Xiaomi