Activating debugging mode in the Android operating system opens up completely new device management options for the owner of the Xiaomi Redmi 9 smartphone. This feature, originally created for application developers, is now actively used by ordinary users to deep clean the system, install custom firmware or save data when the screen is locked. Without activating this hidden parameter, many advanced tools simply will not be able to interact with your gadget through the computer.
The switching process is not complicated, but it requires care, because the activation menu is hidden from the eyes of the average user to avoid accidental changes. You have to go from basic settings to the engineering menu, where the key switches are located. Properly executing all the steps ensures a stable connection between the smartphone and the PC, which is critical for data transfer.
In this article, we will take a closer look at each step of the setup, focus on drivers, and look at how to solve problems if your computer stops seeing your phone. You will learn how to safely use the ADB protocol and why you need fastboot mode. Understanding these processes will help you feel more confident when working with the technical side of your Redmi 9.
Why you need USB debugging and developer mode
USB debugging mode is a bridge that allows a computer to send special commands to a phone without passing the standard user interface, and it's not just for programmers who build applications, but also for enthusiasts who want to root or remove system debris that can't be erased in the usual way, through which system logs are transmitted, specialized utilities are installed, and fine-tuning of the hardware is done.
Many people mistakenly believe that this feature is only for creating software, but its range of applications is much wider, for example, with debugging you can control your phone from the keyboard and mouse of your computer, take screenshots of the entire screen in high resolution or stream an image to a large monitor without delay, and it is the only way to unlock the bootloader to install modified versions of Android.
⚠️ Note: By enabling the developer mode, you take responsibility for system changes.Do not connect your Xiaomi Redmi 9 to suspicious public charging stations with activated debugging, as this can create a data vulnerability.
It should be noted that activating this mode changes the behavior of the system a little, a new icon may appear in the notification curtain, and a whole section will open in the settings with dozens of parameters affecting the operation of animations, background processes and energy saving. By default, the mode is disabled on all Xiaomi devices to ensure the security of user data.
Activate the developer menu on Redmi 9
The first step to enabling debugging is unlocking the hidden partition in the settings. In the MIUI shell that's installed on Redmi 9, this item is hidden deep in the About menu. You need to find the version information and do a series of quick taps. It's the standard random activation protection that works on all the devices of the brand.
The process is this: open the Settings app, scroll down to About Phone, and find the MIUI version. This is the one you need to quickly tap 7-10 times in a row, and once the meter reaches the desired value, the system will give a notification "You became a developer!".
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If nothing happens after 10 taps, check if you have screen time lock or parental controls enabled, which may block access to system settings.
Once you've done the procedure successfully, the new "Developers" option will appear in the main settings menu, "More" section, and that's where all the switches are located. If you can't see this item right after you unlock it, try closing the settings app completely and opening it again.
Step-by-step instruction for debugging
Now that you have access to the advanced settings, you can go to the direct activation of the function. Go to the Settings menu, select "More" and find "Developers" on the inside, you'll see a lot of options, but we're interested in the specific section related to the connection.
Find the line "Debug on USB" and put the slider in the active position. The system will warn you that the data may become vulnerable, and ask you to confirm the action. Press "OK." Then a request for debugging permission may appear on the screen - this is normal, confirm it.
☑️ Checking debugging activation
It's important to understand the difference between simple file transfer and debugging. When you connect a cable, the phone may suggest you choose to work. USB: "Charging only", "File transfer" or "Debugging by USB". To work with ADB It is necessary that the developer menu is lit green indicator, and when you first connect to a new computer on the smartphone screen will appear dialog box with a request for authorization. RSA-key.
Make sure to check the "Always Allow from this computer" box so you don't have to confirm the connection every time you connect, and if you're connecting to someone else's PC, you better not give them permanent permissions.
Installation of drivers and connection to the PC
Even if all the settings in the phone are done correctly, the computer may not recognize the device without the appropriate drivers. Windows 10 and 11 often installs them automatically, but for stable work with Xiaomi, it is better to use official components.
To get started, download and install the ADB Driver Installer package or use the official Mi PC Suite tool. After installing the drivers, connect your phone with a cable. If your phone appears in the Windows Device Manager under Portable Devices or Other Devices with a yellow exclamation mark, then the driver is incorrect and needs to be updated manually.
| Component | Appointment | Where to download |
|---|---|---|
| ADB Driver | Basic communication with Android | Official Android website |
| Fastboot Driver | Firmware and unlock mode | Xiaomi/Mi Community Website |
| Mi Unlock Tool | Unlocking the loader | miui.com/unlock |
| USB Drivers | Common interface drivers |
The quality of the cable is critical. Cheap cables that come with some accessories often only support charging and don't have lines to transmit data. If the computer makes a connection sound but the device isn't detected, try replacing it. USB-cable to a qualitative analogue with support for data transmission.
Solving Typical Connection Problems
One of the most common problems is when the phone is charging but the computer can’t see it. In this case, first check the USB port. Connect the cable to the connector behind the system unit (direct to the motherboard), as the front ports may not give enough voltage or have poor contact.
Another common mistake is ignoring the RSA authorization request. When you first connect Redmi 9 to a PC with debugging enabled, a window pops up on your smartphone screen with a digital code and the "Cancel" and "Allow" buttons. If you just click "Cancel" or ignore the window, the connection will not be established.
What to do if the authorization request does not appear?
Sometimes, an antivirus or Windows firewall can block a connection to an unknown device. Try temporarily disabling protection or adding an exception to adb.exe processes. Also make sure that the phone in developer mode has enabled the option "USB Configuration by Default" and MTP mode is selected.
Using ADB commands for Redmi 9
Once you've successfully connected, you can go to practical use. You'll need a folder with Platform Tools to work with the command line. Open the terminal in this folder and type in the adb device command. If you see your device's serial number and device status, you've established the connection successfully.
With ADB, you can do a lot of useful things, like the adb shell pm list packages, which will show you a list of all the installed applications, and the adb uninstall --user 0 name.packet will remove the system application without superuser rights, which is a powerful tool to clean the system of preinstalled software.
- 📱 Screenshot: Adb shell screencap command -p /sdcard/screen.png Store the current screen image in the phone memory.
- 🔄 Reboot: Adb reboot will reboot the smartphone, and adb reboot bootloader will put it in Fastboot mode.
- 📂 File Transfer: Adb push command file.apk /sdcard/ upload a file from a computer to a phone.
- 🛑 Stop the process: the adb shell am force-stop command com.android.phone will forcibly close the specified application.
Don't be afraid of the command line, it's one of the most effective ways to control a device, but remember that executing commands you're not sure about can cause the system to run in an unstable way. Always check the syntax before you type.
Security and additional settings
Using USB debugging requires certain precautions: Don't leave your phone connected to your computer with debugging enabled when you're away from it, especially in public places or the office. An attacker with physical access to the device can access your data or install malware.
There's a useful feature in the developer menu called "Disable USB Debugging," which automatically turns off mode when you lock your screen or turn off your cable, and it's recommended that you activate this option to improve security, and that you check the list of computers you've given access to periodically, and revoke permissions for older devices.
⚠️ Warning: Never connect your Xiaomi Redmi 9 with debugging enabled to other people's computers for charging. Through the open debugging port, you can copy photos, contacts and even passwords saved in the browser.
In addition to debugging, you can find animation speed, background limit, and location simulation settings on the developer menu, and changing these settings can speed up the interface, but beware: setting a background limit to zero can cause applications to permanently close once they leave.
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USB debugging is a powerful tool that turns your smartphone into an open system for management, but requires strict access control and understanding of the actions performed.