Owners of Xiaomi smartphones often face the need to fine-tune the device beyond the standard options available to the average user. Redmi Note 8 Pro, being a popular model of the mid-segment, has a powerful hardware, but the MIUI software can hide some technical parameters from the owner's eyes. Access to hidden parts of the system allows you to diagnose communication problems, check the operation of sensors or force to switch network modes.
Entering this specialized section requires understanding the risks, as changing critical parameters can lead to unstable operation of the gadget. In this article, we will discuss in detail the safe ways to activate the engineering mode, explain the purpose of the main points and warn against actions that can harm your device.
Modern versions of MIUI firmware are based on Android, where the access level is protected from random changes. However, with the right combinations of codes and sequences of actions, you can unlock the extended menu. It's not just a toy for enthusiasts, but a useful tool for those who want to understand why the phone is not catching the network well in a certain area or how to accurately calibrate the proximity sensor after changing the glass.
What is hidden behind the code of the engineering menu
The engineering menu, often referred to as the CIT (Customer Integration Test) or Engineering Mode, is a set of diagnostic tools built into the production phase. On the Redmi Note 8 Pro, this section allows you to test each component separately, from the vibrator and flash to the GPS and Bluetooth modules. It's not like the developer menu, which is available to everyone, but a deeper level of interaction with the hardware.
The main purpose of this interface is factory testing and quick diagnostics of malfunctions in service centers, so that the user can independently check the screen for broken pixels or determine whether the microphone is working correctly. It is important to understand that these are the settings that affect the RF module, and changing them without proper knowledge can lead to the fact that the phone will stop seeing the SIM card.
⚠️ Note: Amendments to the sections related to IMEI Or calibrate your antenna, which can have irreversible consequences. Use this section only to diagnose or reset your settings if you are confident in your actions.
Unlike standard settings, the interface of the engineering menu can look ascetic and even intimidating. There are no beautiful icons, only lists of parameters and numerical values. Xiaomi Redmi Note 8 Pro is characterized by several access layers, where some features can be hidden or require a special password, which is known only to authorized service centers.
Why can the menu differ on different firmware?
Preparation of the device for diagnosis
Before you start activating hidden functions, you need to make sure that the smartphone is ready to interact with the system commands. First of all, check the battery power: to conduct a full diagnosis, the charge level should be at least 40-50%. Some tests, such as screen check or GPS, can be energy intensive, and suddenly turning off the device during the process is undesirable.
It's also recommended to back up important data. Although logging into the menu through codes doesn't mean resetting, the human factor hasn't been reversed. Accidentally pressing Clear eMMC or a similar cleanup function can erase all user data without recovery. Save contacts and photos to the cloud or computer.
Make sure that the device is inserted SIM-card if you plan to test the communication features. Without an active SIM card, many menu items associated with the network will be displayed in gray or give an error when you start. For the Redmi Note 8 Pro, dual SIM card support is relevant, so it is advisable to check the operation of both slots.
☑️ Readiness of Redmi Note 8 Pro for tests
Methods of entry through dialing
The most common and fastest method of activating the engineering mode on Xiaomi smartphones is the use of the USSD-These commands are entered in the standard Phone app as a regular number. For the Redmi Note 8 Pro, the most effective is the code ##6484##. If you enter the last digit correctly, the screen will automatically switch to the test menu, no need to dial the beep.
If the core code didn’t work, which sometimes happens on specific firmware versions, you can try an alternative: ##4636##. This code opens the test menu for phone information, which is part of standard Android, but on the MIUI shell it also provides access to some engineering data, including usage statistics and battery information.
Type characters carefully, without pause. Some devices activate the smart dial function, and the code may run ahead of time or fail due to autocorrection. If the code set ##6484## does not work, check if the input function is blocked. USSD-codes by your carrier, although this is rare for system codes.
The main codes for the Redmi Note 8 Pro:
#6484## - The basic engineering menu (CIT)
#4636### - Android Test Menu
*#06# - IMEI checkIt is worth noting that on global firmware versions, some codes can be cropped by the manufacturer for security or interface simplification, in which case, if the code does not respond, your version of MIUI may limit this method of entry, and you will have to resort to other methods described below.
Alternative activation methods through settings
If a set of codes is unavailable or blocked by the system for some reason, there is a built-in way to get into the test menu through the standard settings app. This method is often more stable, because it is a regular shell function. MIUI, Not a hidden trick. To do that, go to Settings. → The phone. → All characteristics.
In the list that opens, find Kernel version. You need to quickly click on this 5-7 times in a row. If you do the right actions, the same CIT menu that the code calls will open, and the good thing is that it works even when the Phone application has restrictions on entering special characters.
Another option for advanced users is to use the MTK Settings app or similar utilities available in the Play Market, since the Redmi Note 8 Pro is built on the MediaTek platform. These applications create a shortcut leading directly to the engineering menu. However, using third-party software requires caution and broad permissions, which can carry risks to data security.
⚠️ Note: When using third-party applications to log into the engineering menu, you are trusting access to system settings to an unknown developer.
The multiple-click method is the safest and most preferred method if the codes don’t work, it doesn’t require any additional software installation and ensures that you’re in the section that’s designed to test Xiaomi hardware.
Overview of the main sections and tests
Once you log in, you'll see a list of tests, each designed to test a specific node on your smartphone. For example, the Display test allows you to check the screen for defects by changing colors across the entire display. The Touchpanel test will help you identify touchscreen problems by drawing lines that should disappear when you conduct your finger.
Special attention should be paid to the communication-related sections: GPS, WLAN and Bluetooth points allow you to start scanning the available networks and devices. In the GPS section, you can see the number of satellites visible and the strength of the signal, which is useful for diagnosing navigation problems. The Redmi Note 8 Pro with its powerful NFC module is also available for a corresponding test.
Below is a table of the main tests and their assignments to make it easier for you to navigate the list:
| Name of the test | Function | Checks |
|---|---|---|
| Version | Information | Software and equipment versions |
| Display | Visual test | Screen matrix for broken pixels |
| Touchpanel | Touch test | Touchscreen and multi-touch |
| Receiver | Sound test | Speaking speaker |
| Vibrator | tactile | Vibration motor |
Some tests are interactive and require you to do things like press Pass or Fail after checking; others run automatically and give you results; it's important to take tests consistently if you're doing a full diagnostic of the device after you've bought it from your hands or repaired it.
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If the camera test shows a black screen but other features are working, try restarting the device. Sometimes the camera process freezes in the background.
Network and radio configuration
One of the most popular features of the Xiaomi engineering menu is to configure the preferred network type. Often it happens that the phone “clings” to a weak 3G signal instead of a stable 4G, or vice versa. Through the menu ##4636# (Phone Information section), you can force the modem to work.
In Set Preferred Network Type, you can select a specific standard. For maximum speed in confident coverage areas, choose LTE only. However, be careful: this mode may not work incoming calls unless VoLTE technology is configured, since voice is transmitted over 2G/3G. The optimal option for everyday use is LTE/TD-SCDMA/UMTS/GSM.
The Redmi Note 8 Pro, which is based on the MediaTek chipset, also has settings available via the MTK Settings menu (if installed) where you can adjust the LTE (Band Locking) frequencies in more detail, for example, making the phone work only at the frequencies of a particular operator, which sometimes improves the stability of the connection in dense urban areas.
Recommended network settings:
LTE only: 4G only (calls can't pass without VoLTE)
NR/LTE/GSM: 5G/4G/2G (automatic selection of the best)
WCDMA only: 3G only (for battery saving in the bad 4G zone)Changing these settings doesn’t require root rights, but it’s reset once the device is restarted in some firmware versions. If you need to fix the settings, you may need to use special macro applications or deeper system intervention, which is beyond basic diagnostics.
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Forced “LTE Only” activation can significantly speed up mobile internet, but will make it impossible to make regular voice calls if your carrier does not support VoLTE.