The hidden engineering menu on Xiaomi Redmi Note 7 smartphones running MIUI 12 is a powerful tool for fine-tuning the device, diagnosing hardware components and changing hidden parameters. However, access to it requires caution: wrong actions can lead to malfunctioning of the phone or even bricking. This article will help you safely enter the engineering menu, understand its main sections and avoid typical errors.
Unlike standard MIUI settings, the engineering menu provides extended control over the radio, display, battery and other components. It is especially useful for power users who want to optimize performance, check the performance of sensors or adjust network settings. But remember: Xiaomi does not recommend changing the settings in this menu without a clear understanding of their purpose.
What is an Engineering Menu and Why You Need It
The Engineering Mode is a hidden partition of the Android operating system for service centers and developers. On the Redmi Note 7, it allows you to:
- 🔧 Check the condition of hardware components (display, speakers, microphone, cameras)
- 📡 Configure the parameters of the mobile network (LTE, 3G, 2G) and wifi
- 🔋 Testing the battery and charging
- 🎛️ Change hidden system parameters (e.g. sensor sensitivity)
It is important to understand that changes in the engineering menu are not always reversible, for example, incorrect network settings can lead to loss of communication, and changes in the frequencies of the processor can lead to overheating of the device, so it is recommended to back up the data before any manipulations.
On MIUI 12, the engineering menu has multiple access levels, some sections are open to all users, while others require additional permissions (such as unlocked bootloader or root access).
How to log into the engineering menu on Redmi Note 7
There are several methods to open the engineering menu on the Redmi Note 7 with MIUI 12, the simplest is to use secret codes that are entered through the standard Phone app.
Basic code for entry:
##4636##Once you enter this code, you will open a menu with the phone information, battery usage statistics, usage statistics, and Wi-Fi information sections, but this is only the basic version of the engineering menu.
##36446337##This code will open Engineer Mode with tabs MTK Engineer Mode (for devices running MediaTek processors) or Qualcomm Engineer Mode (for smartphones on Snapdragon). Redmi Note 7 uses a Qualcomm Snapdragon 660 chipset, so you will open the second menu.
Backup of important data
Charge your phone at least 50%
Ensure the stability of the network connection (if required)
Do not use third-party applications to log in without checking their security-->
Sections of the engineering menu and their purpose
The engineering menu on the Redmi Note 7 consists of several key sections, each of which is responsible for certain functions of the device.
| Section | Appointment | Risks of change |
|---|---|---|
| Telephony | Setting up mobile network parameters (GSM, LTE, VoLTE) | Loss of communication, inability to call |
| Connectivity | Testing Wi-Fi, Bluetooth, GPS | Unstable connection to networks |
| Hardware Testing | Checking sensors, cameras, speakers | Minimum (diagnosis only) |
| Location | GPS and geolocation settings | Incorrect location determination |
The most dangerous part for inexperienced users is the Telephony partition, where you can change the Band Mode settings, which will lead to loss of network if you choose inappropriate settings for your operator. Also in this section there is the Network Select option, which allows you to manually select a network - the wrong choice can make the phone "invisible" for base stations.
The Hardware Testing section is safe for diagnosis.
- 🔊 Performance of speakers and microphone
- 📸 Quality of cameras (front and main)
- 🌡️ Accuracy of sensors (accelerometer, gyroscope, compass)
- 🔋 Battery condition (voltage, temperature)
💡
Before testing the camera in the engineering menu, close all apps that use the camera (such as Instagram or Snapchat).
Dangerous settings: what can not be changed without experience
Some of the options on the engineering menu can irreversibly damage the device or render it unsuitable for normal use.
⚠️ Note: Change of settings in Telephony section → Band Mode without knowing the frequencies your operator supports will lead to a complete loss of mobile communication.
Other dangerous settings:
- 🔥 Telephony → NV Rebuild – can erase important network settings
- ⚡ Hardware → Charge Battery – Incorrect charging parameters can damage the battery
- 📡 Connectivity → Wi-Fi TX Power – Changing the transmission power can violate the laws of your country
- 🔄 Location → AGPS — misalignment GPS This can make geolocation unusable.
Be especially careful with the MTK Settings partition (if available). Although Redmi Note 7 runs on Snapdragon, some firmware may contain residual settings from MediaTek. Changing the settings in this partition is almost guaranteed to cause crashes.
What if the network signal is lost after the change?
How to exit the engineering menu and return the standard settings
To exit the engineering menu, just press the back or home button, but if you change any settings, you may need to reset them. There are several ways to return the original settings:
1. Software reset through the engineering menu itself:
Find the Restore Defaults section (usually at the bottom of the screen)
Confirm the reset of all parameters to the factory
- Reset the device.
2. Reset network settings in standard MIUI settings:
- Go to Settings. → SIM-maps and mobile networks → Resetting network settings
This will bring mobile and Wi-Fi settings back to factory settings.
3. Hard reset (if the device is not operating in a stable manner):
- Turn off the phone.
- Press the Power button + Volume up before the Mi logo appears
Select Wipe Data (will delete all user data!)
⚠️ Warning: Hard reset removes all data from the device, including photos, contacts and installed apps.Be sure to back up through Settings before this procedure → The phone. → Backup.
Alternative methods of accessing the engineering menu
If standard codes don’t work (for example, because of modified firmware), you can try alternative methods:
1. Through the "Testing" annex:
Download the MTK Engineering Mode or Qualcomm Engineer Mode app from Google Play
- Launch it and provide the necessary permissions
The application will open the engineering menu with advanced options
2. With the help of ADB-commands (requires included debugging by USB):
- Connect the phone to the PC.
- Enter the command:
adb shell am start -n com.android.settings/.EngineerMode- This will open the engineering menu directly.
3. via Recovery Mode (power users only):
- Boot in recovery mode.
- Choose Advanced → Engineer Mode
- This method doesn't work on all firmware.
When using third-party applications to access the engineering menu, be sure to check their reputation. Some programs may contain malicious code or require unnecessary permissions (for example, access to SMS or contacts).
💡
The safest way to access the engineering menu is to use standard codes (#4636## or #36446337##). ADB-The command should be applied only when necessary and with an understanding of the possible risks.
Frequent mistakes and their solutions
When working with the engineering menu, users often face typical problems, and here are the most common ones and ways to solve them:
1.The code is not working:
Make sure you enter the code correctly, without spaces
- Try using the alternative code ##36446337##
Check if the antivirus or security app is blocking access
2.The menu opens, but the section is empty:
This is normal for some MIUI 12 firmware where the manufacturer has restricted access.
Try to update the firmware to the latest version
- Use it. ADB-method for accessing hidden partitions
3. After the changes, the sound disappeared:
- You may have changed your settings in the Hardware Testing section. → Audio
Return all sliders to the original position or reset settings
Check if the system sounds are disabled in the standard settings
The device shall overheat after changes:
Most likely, the processor parameters in the Hardware → CPU section were changed.
Return the settings to the factory immediately.
If the temperature continues to rise, perform a hard reset.
If none of the methods helped solve the problem, contact Xiaomi service center, inform the specialists that you have made changes to the engineering menu, this will help to diagnose the malfunction faster.