Xiaomi Redmi Note 9 is built on the Android operating system with the proprietary shell MIUI, which by default hides many system functions from the eyes of the average user. However, for advanced owners and enthusiasts, there is a hidden section that allows you to manage the deep parameters of the device, debug applications and change the speed of the interface. This section is called the developer menu, and its activation is the first step to full control over the gadget.
Many users wonder where this item is in modern firmware versions, since it does not appear in the standard settings list immediately after purchase.Developer mode in Redmi Note 9 was not removed by the company, but only hidden to prevent accidental changes in critical system parameters by beginners. Enabling this section is absolutely safe, if you understand what features you are activating, and do not change the settings in which you are not sure.
In this article, we will take a closer look at the process of activating the hidden menu, look at its basic features available for the Xiaomi Redmi Note 9, and explain how to use tools such as debugging over USB or changing the animation speed. You will learn how to reset the USB timer and why it can be useful when connecting a smartphone to a computer. We will also touch on the topic of security and warn about the parameters, changing which can lead to unstable operation of the device.
The process of activating the hidden menu in MIUI
In order to access advanced settings, you need to follow a specific sequence of actions in the About Phone menu. Unlike pure Android, where the developer item is often hidden in the System section, the MIUI shell uses the activation method by repeatedly clicking on the build number. This is the standard procedure for all Xiaomi devices, including the Redmi Note 9.
First, open the Settings app and scroll to the bottom of the list. Find the About phone item and click on it. It shows all the basic information about your device, including the Android version, the MIUI version and the build number, and that's the last parameter we need to activate the engineering mode.
Find the line "Version" MIUI» (or “Build Number” in some localizations) and click on it quickly 7-10 You don't have to stop after the fifth time, keep pressing until a pop-up notice appears on the screen, and the system may ask you to enter the unlock password to confirm your actions.
⚠️ Warning: If nothing happens after ten taps, try changing the pace of the taps, make them faster or more rhythmic. Also make sure that the device does not include special features that block quick touches.
Once you see the message “You are a developer!” or “Developer Mode is activated,” the procedure will be completed. Now the new menu item will appear in the list of main settings, usually located immediately under the “Advanced Settings” section or at the bottom of the main list, depending on the version of your firmware.
☑️ Activation of the developer mode
Location of the item in the system and navigation
After successfully activating the hidden partition, users are often lost because the icon does not appear on the desktop. In Xiaomi Redmi Note 9, these settings are accessed exclusively through the main menu of system parameters. You need to go back one level up from the About Phone section to the main settings menu.
Scroll down to the end, and it'll be called "Advanced" or "Developers" depending on the language of the interface, and in English, it's called Additional settings → Developer options. Inside, you'll find a long list of technical parameters, grouped by functionality.
Navigating inside the developer menu requires care, as there is no tab division, and all options are displayed in a single list. For ease of search, you can use the search function by settings, if your version of MIUI supports search within specific menus, or simply scroll through the list manually.
| Parameter | Location on the menu | Function |
|---|---|---|
| USB debugging | Top of the list | Allows the computer to control the phone |
| Window animation | Section "Drawing" | Changes the speed of visual effects |
| USB-configuration | Right under debugging. | Selection of port mode (MTP, PTP, etc.) |
| Load demonstration | Monitoring section | Shows the processor boot in real time |
It is important to note that some items may differ depending on the version of the installed firmware MIUI 12, 13 or 14. Xiaomi periodically changes the structure of the menu, adding new features for debugging or removing outdated.
Main functions and management of animation
One of the most popular reasons Redmi Note 9 users go into developer mode is to speed up the interface. Standard animations for window transitions can seem slow, especially on larger-screen devices. In the developer menu, you can zoom in on the animation, which will visually speed up the system's response.
Find the Drawing section and look at three options: Windows animation, transition animation, and animation duration. By default, they are all set to 1x. By changing them to 0.5x, you make the interface more responsive, and setting the No Animation value eliminates visual effects completely, which can be useful for saving battery power.
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Setting the animation value 0.5x instead of completely disabling (0x) keeps the interface smooth, making it much faster, and completely turning off the phone can make it less comfortable for the eyes.
In addition to speed control, this section also includes features for demonstrating actions, such as the "Show Touch" option that displays a white circle at the touch of the screen, which is useful when creating screencasts or training materials, and you can also enable a pointer display that shows the exact coordinates of the touch.
Another important feature is the management of background processes. In the "Applications" section, you can limit the number of background processes. However, be careful: aggressively restricting background tasks in MIUI can lead to the fact that messengers will stop receiving notifications or music will stop when the application is folded.
- 🚀 Speeding up the interface: Reducing the scale of animation to 0.5x Navigate the menu instantly.
- 🎨 Touch Demonstration: Press Point Visualization Useful for Recording Video Instructions.
- ⚙️ Background Processes: Allow the system to close applications, but requires careful setup.
Debugging by USB and working with a computer
Function Debugging by USB (USB Debugging is key to the deep level interaction of a smartphone with a computer, and it allows you to send commands through the protocol. ADB (Android Debug Bridge, install apps directly from your PC, make full system backups, and even get root rights (although the latter is on the newer side). MIUI arduously).
To activate, find the "Debugging by" switch USB» At the top of the developer menu, turn it on. When you first connect to your computer, Redmi Note 9 will ask you to confirm the debugging with the display. RSA-You need to press "Allow" to establish a trusted connection.
adb devicesThis command in the computer terminal will let you check if your PC sees your device, and if you're set up correctly, you'll see the serial number of the phone, and if the device isn't identified, check the cable, it should support data transfer, not just charging.
Why can't the computer see the phone?
An important aspect of working with USB in Xiaomi is the availability of a security timer. Once debugging is enabled, the system can restrict some actions (for example, installing applications from unknown sources via ADB) until you confirm the action on the phone screen for 10 seconds.
Resetting the USB Restriction Timer in MIUI
Xiaomi Redmi Note 9 owners often face annoying shell feature MIUI: timer USB. This feature was introduced to protect user data, but it greatly hinders developers and those who often connect the phone to different computers. ADB allowed only for a short time after connection.
Fortunately, there is a feature in the developer menu that allows you to bypass this limitation. USB» (Turn off USB monitoring or similar wording depending on MIUI Enabling this option removes time constraints on debugging, allowing commands to be executed seamlessly.
⚠️ Attention: Turning off timer monitoring USB It reduces the security of your device when you connect to unknown computers, and only use this feature if you trust the computers you connect your smartphone to.
Also, you can find the default USB configuration setting in the same section, where you can set the "File Transfer" or "MTP" setting, so that every time you connect to a PC, your phone automatically switches to data exchange mode, not just charging, so you don't have to reach for the notification curtain every time you connect to your PC.
Additional tools and system monitoring
The developer menu in Redmi Note 9 hides a lot of diagnostic tools, such as Process Statistics, which lets you see how much RAM each application uses and force you to stop voracious services, which can be more useful than a standard task manager.
For those who like technical monitoring, the "Show CPU usage" option is available, and when activated, a graph will appear in the upper right corner of the screen showing the current CPU load in real time, which helps to understand what process is causing the lag or heating of the device.
Also worth mentioning is the “Stay awake” feature, which, if activated, will keep Xiaomi’s screen from going out while the phone is connected to the charger, which is extremely convenient when using your smartphone as a navigator, digital photo frame, or when reading long texts from the screen.
- 📊 CPU loading: Visual load graph helps identify buggy applications.
- 🔋 Sleepless mode: The screen burns constantly while charging, convenient for stationary use.
- 📡 Bluetooth audio codec: In the "Network" section, you can select a high-quality codec (aptX, LDAC) wireless.
In the Network section, you can also find settings for forced use of certain types of Bluetooth networks or protocols, for example, you can choose the LDAC or aptX HD audio codec if your headphones support these standards, which will significantly improve sound quality compared to the standard SBC codec.
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Using the developer menu allows not only to speed up the interface, but also to turn the smartphone into a powerful diagnostic tool, but requires caution when changing network parameters.
Security and exit from developer mode
Despite the name, the developer mode does not give full access to all the files of the system (as root-rights), but changing some parameters can lead to unstable work Redmi Note 9. For example, changing the minimum width (DPI) can make the interface unreadable, and disabling hardware acceleration - slow down the graphical interface to the impossible.
If you notice that the phone is starting to behave strangely, or you just want to get it back to normal, you don't have to drop the phone back to the factory settings. There's a master switch at the top of the Developer menu. You just turn it off, and all the options you've changed will go back to factory values, and the menu will disappear from the settings.
Remember, resetting the phone itself also disables developer mode, so if you sell or give the device to a new owner, be sure to do a full reset (Wipe data) to hide your previous settings and remote trusted computers.
⚠️ Warning: Never enable the Always Allow Debugging from This Computer feature on someone else's or public PCs.This could give an attacker full access to your data if the phone is unlocked.
So the developer mode in Xiaomi Redmi Note 9 is a powerful tool in the right hands, allowing you to fine-tune the visual part of the system, establish a stable connection to the PC for file transfer and debugging, and access hidden diagnostic information, the main rule is to change only those parameters that you understand.