Where to find an engineering menu in Xiaomi Redmi 4X

Owners of budget-friendly but reliable smartphones like the Xiaomi Redmi 4X often face the need to fine-tune communication settings or diagnose hardware components. The standard MIUI shell interface hides many tools available to developers and engineers. It is for this purpose that there is a special section, popularly called the “engineering menu” or CIT (Customer Integrated Test).

There are a number of ways to get into this hidden section, but it's important to understand the difference between modem service mode and a full hardware test. If you're wondering where the engineering menu is in the Redmi 4X, chances are you'll either need to check the microphone and sensor or amplify the cellular signal. In this article, we'll take a look at all the legal methods for accessing these features.

It should be noted that interference with system settings requires caution. Incorrect change of parameters of the radio module can lead to the fact that the phone will cease to see. SIM-So before you start any manipulation, carefully study the information about each function.

What is the Engineering Menu and CIT

The engineering menu in Android smartphones, including Xiaomi devices, is a low-level diagnostic interface. In the context of Redmi 4X, the term is often understood to mean two different but related things. One is the hardware testing menu (CIT), which allows you to check the performance of each component, from the vibrator motor to the accelerometer. The other is the modem service menu, which is responsible for communication parameters.

CIT-The mode is the safest for the average user, and it's designed to do a factory check of the device before it's sold, and you can't break the phone software here, because the interface only offers to run the tests. You can run a screen check to see broken pixels, or test multi-touch by swiping your finger across the display.

The modem service menu, accessible through special codes, allows you to control the settings of the radio part. Here you can switch the preferred network type, reset the IMEI settings (which requires caution), or (view) (detailed information) about connecting to the tower. Changing the parameters in the Band Mode section without understanding their meaning can lead to a complete absence of a signal in your region.

⚠️ Note: Do not change the values in the sections related to IMEI Or calibrating the antenna, if you're not a qualified technician, and it could disrupt the device.

Understanding the differences between these modes is critical, and if your goal is just to check if the speaker is working after a drop, you need a CIT, and if you want to try to improve your low-cost catch, you need to adjust your modem.

The main ways of entering through codes

The fastest and most proven way to get into hidden parts of the system is to use the USSD-In the Redmi phone. 4X They're firmware-level, so you don't need a superuser (Root) to activate them, but you just have to open a standard caller and type in a certain combination of characters.

The full hardware test (CIT) is accessed using the code ##6484##. Once you enter the last characters, the screen automatically switches to a white background with a list of tests, which is the menu where you can check all the hardware on your smartphone. No additional pressing of the call button is required.

If you are interested in the modem's engineering settings menu (often called the MTK or Qualcomm menu, although Qualcomm is in the 4X), the code will be different. Try dialing ##4636##. This code opens the Testing section, where the "Phone Information", "Usage Statistics" and "Wi-Fi" items are available.

In some versions of the MIUI shell, codes can be blocked by the carrier or manufacturer. If the set of numbers does not lead to anything, try entering the code ##64663##. This is an alternative combination to enter service mode on some Redmi modifications.

Alternative login through system settings

It’s not always convenient to type long codes, especially if the “ring” is not working properly. There is an alternative way through the GUI. In Xiaomi smartphones, the input to the test mode is often integrated into the “About Phone” menu, which is especially useful if the keyboard does not respond to the input of special characters.

To use this method, go to Settings → About Phone. Here you need to find Kernel version. Unlike many other smartphones where you need to tap the build number, MIUI requires you to click on the "kernel version" line to enter CIT, and you need to do this quickly and repeatedly, about 5-7 times in a row.

After a few taps, the system recognizes your activity as a login request. The screen blinks and you'll see the familiar CIT menu with blue or black test buttons. This method works consistently on most versions of MIUI installed on the Redmi 4X.

If the kernel version login didn’t work, try searching the same menu for All Specifications and clicking on this item quickly. The logic of hidden triggers in different firmware versions (Global, China, Developer) may vary slightly, but the principle remains the same – finding the active element in the device information section.

Functionality and testing capabilities

Once you've successfully logged into the engineering menu, you'll see a list of dozens of items, each one of which is responsible for checking a particular node on your smartphone, and you'll need to be able to understand them to make a diagnosis effectively, and the menu is usually divided into logical groups, although in older versions of CIT it can look like a simple list.

Among the available tests you will find:

• 📱 Display / LCD — Checking the screen for broken pixels, gradients and touch reactions, allowing you to see how different colors are displayed.
• 🔊 Speaker/Receiver is a speaker test. The phone will play the melody through the main speaker and through the spoken one so you can appreciate the purity of the sound.
• 📶 SIM Card - reading check SIM-It shows if the phone sees the card and allows you to check the balance (if supported by the operator).
• 📡 GPS — Verification of the navigation module, showing the number of satellites visible and the coordinate accuracy.
• 🔋 Battery – displays real capacity, voltage, temperature and charging status in real time.

The Touchpanel test is a special test, which is required when you buy a used device or after you change the glass, and in this mode, the screen turns black, and you have to swipe your finger along all the lines of the grid. If the line lights up, the sensor works. If there are breaks, the sensor does not respond in this area.

The Vibrator test is also available, which makes the vibrator run continuously or intermittently, to help determine whether the motor has worn out or become quieter or louder than normal.

Network and modem setting

The section that users most often search for when asking where the engineering menu in Xiaomi Redmi 4X is the network settings, which are usually accessed through code ##4636## and select Phone Information, which hides the important controls of Qualcomm's radio module.

In this section, you can find the drop-down list of Set Preferred Network Type, which is the default mode recommended by the operator (e.g. LTE/TD-SCDMA/GSM). However, if you are in an area where 4G signal is unstable, the phone can constantly jump between standards, quickly landing the battery.

You can manually force your phone to WCDMA only (3G only) or GSM only (2G only), which often helps keep your battery power on your trips or provide a stable, albeit slow, internet experience where LTE only catches the edge.

Another useful feature is the viewing IMEI state SIM-This shows if you're registered. SIM-map on the network, what type of signal is used (LTE, HSPA, EDGE) and the signal power level in dBm. the closer the value to zero (for example, -80 dBm is better than -110 dBm, the better the connection.

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If the Internet is lost after the network type change, don't panic. Just return the setting to its original state or select LTE/TD-SCDMA/GSM (auto) mode.

Diagnostics of sensor and screen problems

Model Redmi 4X known IPS-The engineering menu provides the best tool for checking, the Single Touch and Multi Touch tests, which reveal dead zones or false positives when the phone presses the screen itself.

To do the test, select Touchpanel or Single Touch. The screen will turn black with a white grid. Your task is to slowly swipe your finger along all lines. The lines should change color (usually green or red) to confirm the recording of the touch. Pay special attention to the corners and edges of the screen, where the sensor often fails first.

Multi Touch is a test of the screen's ability to recognize multiple touches at once, which is important for gaming and zooming photos, and if the phone sees fewer dots than you touch with your fingers, then the touchscreen controller is not working properly.

⚠️ Note: If you see in the Touchpanel test that some cells don't light up, but you feel your finger, it's a software calibration failure. CIT. If the cells do not respond physically, a touch screen replacement is required.

You can also check Proximity Sensor in this section, so you can close the top of the screen with your palm, so the digital value should change from 5.0 to 0.0. If that doesn't happen, you may have problems with your speaker or sensor, so that the screen doesn't go out during the call.

Frequently Asked Questions (FAQ)

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The engineering menu is a powerful diagnostic tool, but it's not a panacea, and it's not designed to make deep changes to the system (Root, uninstall system applications).