How to get out of the engineering menu Xiaomi Redmi 4: 5 proven methods

When the Xiaomi Redmi 4 suddenly goes into hardware testing mode, it can take anyone by surprise: the screen is filled with technical labels, and the standard MIUI interface becomes unavailable, causing panic among inexperienced users, a condition known as the Engineering Menu or CIT (Customer Integration Test), designed to diagnose device components in a factory or service center.

Most often, the transition to this mode occurs due to the accidental pressing of the button combination when you turn on or a software failure. Unlike Recovery or Fastboot mode, the engineering menu does not allow you to reflash the phone, but blocks access to basic functions. Understanding the nature of this mode is the first step to quickly return to normal operation of the gadget without losing data.

In this article, we will discuss in detail all possible ways to exit the diagnostic mode on Redmi 4. We will consider both standard methods through the interface and forced options for rebooting if the touch screen has ceased to respond to touch.

What is CIT Mode and Why It Is Enabled

CIT is a diagnostic tool built into the Android operating system, and its primary purpose is to allow engineers to test the health of each individual smartphone module, from the display and touch screen to the communication modules and accelerometer. On the Xiaomi Redmi 4, this mode is activated by special commands or a combination of keys, which sometimes happens accidentally in a pocket or bag.

Getting on this menu doesn't mean your phone is broken or infected by a virus. It's a regular MIUI feature that just waits for commands from the user. However, unless you plan to do a diagnosis, it's useless to be in this mode. The interface here is minimalist and devoid of the usual app icons.

There are several main reasons why the device could switch to this mode:

• 📱 Accidental clamping of volume and power keys at system start.
• 🔧 Introduction of special USSD-codes or commands through the engineering menu.
• ⚡ Operating system failure after failed update.
• 👆 Incorrect pressing in the menu "About the phone" with multiple tapa according to the kernel version.

⚠️ Attention: Staying on mode CIT It does not delete your personal data, photos or contacts, but the constant activation of tests can drain the battery faster than usual.

It's important to understand the difference between this mode and Fastboot. If you see a hare fixing an android on the screen, or you see a Fastboot label on the screen, the exit methods will be different, and in this case we're looking at a list of test names with components on a white or black background.

The method of exiting via the "Exit" or "Back" button

The easiest and safest way to leave diagnostic mode on Redmi 4 is to use the software exit button if the touchscreen continues to work correctly. In most versions of MIUI, the CIT interface provides a stop-to-test button. You need to carefully examine the screen for a button that says Exit, Back or arrow back.

If the sensor responds, just click on this button. The system can request confirmation of action or immediately initiate a normal reboot of the device. In some cases, you need to press the button several times, since the first click can simply turn off the current test, rather than close the menu completely. Be careful not to run new tests, for example, Touchpanel or Display, as this can change the screen calibration.

In a situation where the exit button is not visible immediately, try to find the Version or QC Test button at the top of the screen.Clicking on it sometimes opens an additional menu where the exit option is available.It is also worth trying the standard Back button in the Android navigation bar if it is displayed on top of the testing interface.

Algorithm of actions for program output:

• 👆 Find the Exit or Quit button on the screen.
• 🔄 If there is a back button in the Android interface, press it.
• 📱 Try swiping down to call notification curtains (rarely, but works on older versions).

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If the Exit button doesn’t respond to the first press, try pressing and holding it for 3-5 seconds, which can work as a command to force the test application to close.

Forced resetting of the device

If the software buttons don’t respond or the touch screen ignores touch completely, the only true solution is a hardware reset. For the Xiaomi Redmi 4, there is a proven key combination that allows you to forcefully restart the system, ignoring current running processes, including the engineering menu.

You need to hold the power button for a long time. A standard short press here will not help, because in diagnostic mode it can be reassigned or blocked. You need to hold the button for about 10-15 seconds until the screen is completely turned off.

Once the screen goes out, don't let go of the button right away. Wait another 2-3 seconds to make sure the device has started the shutdown cycle. Once the Mi logo appears, the button can be released. The phone should boot as normal. If the logo comes back with the engineering menu, the Volume Up button may have stuck or is in a pinched state.

Reset combination: Clip Power (10-15 seconds) → Wait for the Mi logo → Release

In the rare cases where the power button doesn't work, you can try the Power + Volume Up combination. Press both buttons at the same time and hold until the vibration or logo. This method emulates the battery removal, which is guaranteed to interrupt any software cycle.

Using ADB to exit the mode

For advanced users who have ADB (Android Debug Bridge) drivers installed on their computer and USB debugging enabled, there is a more elegant way to exit, which allows you to send a command to reboot directly, bypassing physical buttons, which is especially true if the power button on Redmi 4 is faulty.

First, you need to connect the smartphone to the PC through high-quality USB-Make sure the computer recognizes the device. Open the command line or the terminal in the folder with the ADB. Type a command to check the connection. If you see the serial number of the device in response, the connection is established.

To exit CIT mode, use the following command:

adb reboot

This command initiates a regular software reboot. If the system is stuck deeper and a simple reboot doesn't help, you can try the adb reboot bootloader command to go to Fastboot, and from there select the Reboot option (using the volume buttons for navigation and the power button for selection).

Advantages of using ADB:

• 💻 Complete control of the device from the computer.
• 🛡️ Security: eliminates the risk of damage to phone buttons.
• ⚡ Speed: The command is executed instantly.

⚠️ Attention: Method C ADB It only works if the phone has been allowed to “debug by” USB». If you haven’t enabled this feature in the Developer Menu, the computer won’t be able to send a command.

Diagnostics of stuck buttons

One of the most common physical reasons for being constantly hit by engineering menus or tests is mechanical button sticking. On the Xiaomi Redmi 4, which has a metal body, volume buttons can get stuck due to moisture, dust or deformation of the body after a fall.

If you reboot your phone automatically re-entering testing mode, carefully examine the side of the device. Press the volume buttons several times. They should have a clear, ringing click and return to their original position. If the button goes tight or fails, it initiates the entry into diagnostic mode at start.

What can be done at home:

1. Remove the protective case that can press the buttons.
2. Carefully press the Volume Down or Up button several times in a row to develop the mechanism.
3. Blow the area around the buttons with compressed air.
4. Check if there are any visible contaminations in the gaps.

If the button is physically damaged, the software methods will only have a temporary effect, which will require replacing the button plume at the service center, and you can try using software button emulators before visiting the service, if you can get into the system for even a short time.

Code and command table for Redmi 4

For those interested in technical details, below is a table with basic commands and codes related to Xiaomi diagnostics.Knowing these codes helps you understand what actions may have led to the current state, and how to manage hidden features.

Using ##64663## is a standard way to log into the menu you're trying to leave right now, and typing that code into normal dialer mode will open tests again. Be careful about entering other codes, such as those related to resetting IMEIs or calibrating the sensor, as this may require flashing.

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The main reason for the endless cycle in the engineering menu is not a software glitch, but the physical sticking of the volume button when you turn on the phone.

Frequently Asked Questions (FAQ)