Users of budget smartphones often face the need to fine-tune the device beyond the standard MIUI. The engineering menu on Xiaomi Redmi 5 is a hidden system section designed for hardware diagnostics and component testing. Access to this tool allows not only to check the performance of sensors, but also to adjust the parameters that are not available in the usual settings menu.
Owners of the Redmi 5 (codenamed rosy) can use this mode to solve specific problems, such as poor signal reception, inaccurate GPS or problems with multi-touch. It is important to understand that interfering with system parameters requires caution, as incorrect changes can affect the stability of the Android operating system.
In this article, we will take a look at all the legal ways to enter diagnostic mode, review the basic testing features and give recommendations for the safe use of hidden features of your smartphone. # # #64663## is the main and most secure way to enter CIT mode on all Xiaomi devices.
What is the engineering mode on Redmi 5
The engineering menu, often referred to as CIT, is a software interface built into by firmware developers to quickly check components in the factory. Unlike the full-fledged engineering menu of MediaTek processors or older versions of Android, Xiaomi's interface focuses on functional testing rather than deep flashing of the radio module parameters, which makes it safer for the average user who wants to conduct diagnostics.
The main purpose of this section is to check each piece of hardware in isolation. When you run a microphone test, the system blocks other sound streams, allowing you to assess the purity of the recording. The vibrator test provides maximum current, which helps to detect mechanical wear of the part. For the Xiaomi Redmi 5 model, this is especially true, given the age of the device and the possible wear of the physical components.
⚠️ Warning: Changing the settings in the sections marked as "Version" or "Debug" without understanding their purpose may cause software failure.It is recommended to use only the sections with the "Pass" and "Fail" buttons to check.
There's a misconception that you can unlock a bootloader through this menu or get root rights. CIT-The mode is for diagnostic purposes only, but it can be useful in preparing the device for sale to demonstrate to the buyer that all functions are working properly, or when accepting the device from repair.
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The engineering menu on Redmi 5 is a diagnostic tool, not a tool for flashing or deep modification of the system.
Login methods through system codes and settings
The simplest and most reliable method of activating the diagnostic interface is the use of special USSD-They work at the system level and do not require an Internet connection or availability. SIM-There are several combinations that are relevant for the Redmi 5, but their effectiveness may depend on the version of the firmware installed. MIUI.
The first and basic way is to type universal code: Open the standard Phone app and enter the sequence of characters, the system recognizes the command instantly, and the transition to the menu will occur automatically, without having to press the call button.
##64663##If for some reason this combination doesn't work, you can use an alternative way through the About Phone menu, which is especially useful if the on-screen keyboard blocks the input of special characters or works incorrectly.
- 📱 Open Settings and go to About Phone section.
- 🔍 Find the Kernel version (Kernel version).
- 👆 Quickly click on this line. 5-7 successively.
- ✅ On the screen will appear hardware testing interface.
There is also a code ##4636## that opens the test menu, but on modern versions of MIUI for Xiaomi Redmi 5, it is often blocked or redirects the user to standard settings, so the main tool should be considered the code 64663.
Detailed inspection of hardware components
After a successful login, you will see a list of all available tests. The interface is designed in a minimalist style: the name of the component, the check button and the result indicator. For a full diagnosis of Redmi 5, it is recommended to go through all the points sequentially, noting the serviceability of each module.
Special attention should be paid to the tests of the display and touch screen. IPS, The color test can detect matrix defects, and the multi-touch test can detect dead zones or false presses.
☑️ Complete Diagnostics of Redmi 5
The soundtrack is tested separately for the main microphone, the secondary (noise reduction) and the speaker, and the system will record your voice and play it back, or ask you to say a phrase to compare it to a reference, which helps to detect the wheezing of the speaker or the quiet operation of the microphone, which often happens after falls or moisture.
| Component | Type of check | Success criteria | Frequent problems |
|---|---|---|---|
| Display | Visual (colors) | Absence of broken pixels | Burnout, stains. |
| Touchpanel | Multi-touch (10 points) | Drawing all lines | Dead corners |
| Receiver | Sound reproduction | Clear sound in the ear | Wheezing, silence |
| Vibrator | Vibration. | Sensible vibration | Lack of response |
| GPS | Search for satellites | Coordinates found | Long start. |
Remember to check the physical buttons (volume and power). CIT-Pressing mode should cause a change in status on the screen or an audible signal. If the Redmi 5 button stops or does not respond, this will be immediately visible in the test log.
Diagnostics of sensors and communication modules
A modern smartphone is unthinkable without a set of sensors, and Xiaomi Redmi 5 is no exception. Accelerometer, gyroscope, sensor light and proximity — all of them require periodic calibration. It is in the engineering menu that you can start the procedure of resetting the calibration if the phone is not rotating the screen correctly or does not extinguish it when you bring it to the ear.
There's a separate test for the proximity sensor, which shows two values: the top (when the sensor is closed) and the bottom (when the sensor is open), and if the difference between the two is too small, the screen will go out during a conversation, even if you haven't put the phone to your ear, which may require software recalibration or cleaning the top of the screen from contaminants.
What if the sensor is lying?
Wireless communication modules (Wi-Fi, Bluetooth, GPS) are also verifiable. A GPS test will show the number of satellites visible and the accuracy of coordinates. If the satellites are not caught at all, the problem may be both a software failure and a cliff of the antenna plume inside the housing. A Wi-Fi test will try to scan the available networks by checking the radio module.
It is important to note that for testing cellular communication (GSM/LTE) inserted SIM-Without it, the network tests will show an error or be inactive.
IMEI recovery and operation with radio module
One of the most critical features available in advanced engineering menus (often requiring root rights or special utilities) is IMEI recovery. On Redmi 5, an IMEI loss (when the settings say "Unknown") can occur after a failed firmware reflash or a partition table failure.
The standard CIT menu that the code calls doesn't allow you to directly enter the IMEI, but it shows the current values. If you see zeros or incorrect data, then the NVRAM partition is corrupted. Recovery requires superuser rights and a utility like the Xiaomi IMEI Repair Tool or work through ADB.
⚠️ Attention: Change IMEI For a value other than the factory value (indicated on the box) in many countries, it is illegal. Use recovery tools only to return the original identifier.
The recovery process usually looks like this: first read backup (if it is preserved), then through the ADB-The command is recorded on the phone. The command looks something like this: adb shell nvram. -w imei_IMEI". However, without a backup, it is almost impossible to restore a unique factory number, you will have to generate a new one, which can lead to problems with registration in the network.
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Always back up the EFS or NVRAM section immediately after buying a new Xiaomi.This is the only way to guarantee IMEI recovery in the event of a firmware failure.
Frequent problems and methods of their solution
Xiaomi Redmi 5 owners may experience a situation where the engineering menu does not open or tests give an error, most often due to access rights or damage to system files. If the code # # #64663## does not work, check if you have a customized Recovery (TWRP) that could change the system paths.
Another common problem is sticking in the test, and if the phone is getting stuck on the camera or sound, try restarting the device by pressing the power button on the phone. 10-15 Hard Reset (Hard Reset) in the 90% In some cases, the device is removed from the testing cycle.
- 🔋 Battery discharge: Do not perform a full diagnosis if the charge is below 20%, as the tests are energy-consuming.
If none of the software methods helps fix the malfunction identified in CIT, most likely the problem is hardware-based. For example, the failure of the light sensor on older Redmi 5s is often due to the oxidation of the plume, not a software failure.