Debugging by USB on Xiaomi: Enable and Setting Security

Xiaomi’s mobile devices have long since ceased to be just phone calls, becoming powerful tools for developers and advanced users. One of the key features hidden from the eyes of the average owner is the USB debugging mode, which gives access to deep system settings of the Android operating system. Activation of this mode is necessary to install applications outside the official store, reflash the device, reset forgotten passwords or use specialized software to manage the file system.

The process of turning this option on the shell of MIUI or the new HyperOS has its own unique features, different from standard Android. The security system of the Chinese manufacturer requires additional verification steps, including confirmation via SMS and waiting for a timer, which often confuses beginners. Understanding these nuances will allow you to safely activate the developer mode and start working with ADB (Android Debug Bridge) without the risk of damaging the software of the smartphone.

In this guide, we will take a detailed look at each activation step, focusing on security pop-ups that appear when you connect to a computer, how to respond to system requests to avoid blocking debugging access, and what actions are required to successfully pair a device with a PC to transmit data or execute commands.

Activation of the developer menu on the MIUI shell

The first and mandatory step is to unlock the hidden partition in the system settings, which is not available to the user by default. Unlike many other manufacturers, Xiaomi hides this feature deep in the About menu, requiring multiple clicks to activate. To get to the right place, you need to open the standard Settings app and scroll the list to the bottom of the “About Phone” item.

Inside this section, you'll find the line "MIUI Version" or "OS Version," which is usually located in the center of the screen. Clicking seven times on this element will result in a pop-up notification that you've become a developer. After that action, a new item will appear in the main settings menu, in the "Additional" section, called "Extended Settings" or immediately "Developers", where the switches are located.

It is important to note that some firmware versions may have slightly different paths, especially on global versions with Google Play installed. If nothing happens after seven clicks, check if you have a limited user profile or guest mode installed, as they often block the activation of engineering functions due to system security restrictions.

⚠️ Warning: Do not activate items in the developer menu at random unless you know their purpose. Changing the interface zoom or animation settings can make the system unstable or lead to artifacts on the screen.

Enabling debugging over USB and confirmation

Once you successfully log into the Developer Menu, you need to find the USB Debugging Switch and activate it. When you first turn on, the system will issue a warning that it may lead to data leakage or damage to the device if you connect the phone to an untrusted computer.

Immediately after the main switch is turned on, when you connect your smartphone to your computer through a high-quality cable, a request for debugging permission will appear on the screen. This window will display the unique RSA key of the computer you are connecting to. To successfully pair, you must set the box "Always allow debugging from this computer" and click "Allow".

If the request does not appear automatically, try changing the state. USB-Connect to the same developer menu. Find the "Configuration" item. USB by default and select File Transfer mode or «MTP». Sometimes the system defaults to a “Charge Only” mode that blocks data transfer and, accordingly, the debugging request is not initiated.

USB security settings and confirmation via SMS

The most difficult stage for users of Xiaomi devices is the system of protection against unauthorized access, which requires confirmation through the use of the device. SIM-If you try to enable debugging or install an application from an unknown source ADB, The system can send a message saying, "Device failed to check," which means that you need to link your Mi Account to your device.

To pass this check, you need to find the item "Enable verification through the developer menu" SMS» (USB Debugging (Security Settings) and activate it.The system will require you to enter a password from your Mi Account and send a hidden message. SMS to a short number to confirm the phone number, make sure that the smartphone is active SIM-card with a positive balance or tariff allowing sending messages, as without this step is impossible to perform.

The verification process can take anywhere from 15 seconds to a few minutes, which will show a countdown timer on the screen, and if the timer is stuck or the check fails, try switching to flight mode for 10 seconds, then turning it off and trying again, and changing the network from Wi-Fi to mobile Internet before starting the procedure also helps.

Managing Application Installation Permits

In addition to basic debugging, to fully work with tools like Mi PC Suite or third-party APK installers, you need to activate permission to install applications via USB. This option is directly under the main debugging switch and is often ignored by users, which leads to errors when trying to install programs from a computer.

When this item is activated, the system will again require confirmation via Mi Account and SMS, if you have not done so before.This is a critical layer of protection that prevents malicious software from being remotely installed by attackers who have gained physical access to the charging phone. Without this option, adb install commands will end in error.

There is also the option to “Disable ADB Monitoring” that appears on some versions of HyperOS. Its activation avoids constant pop-ups with a timer of 10 seconds with each debugger action. However, using this feature reduces the overall level of security of the device, making it more vulnerable when connected to public charging stations.

Resetting debugging settings and eliminating errors

During operation, a situation may occur when the computer stops seeing the phone, or a request for confirmation. RSA-The key simply doesn't appear, even after you've rebooted, and in these cases, the effective way to solve the problem is to reset the debugging settings. In the developer menu, find the item "Cancel debugging by USB» or USB Debugging Authorizations and click on it.

This operation will forcefully disable all previously authorized computers and clear the cache of the relevant services. After the reset, you need to reconnect the cable and confirm the request on the smartphone screen. It is also recommended that you find the option “Select USB configuration” in the same menu and force the value of “MTP” or “File Transfer” to be set, ignoring the automatic system selection.

If the software reset doesn't work, the problem may be Windows drivers or a faulty cable. Try using the original cable from the kit or a certified analog that supports data transfer, not just charging. Checking the device in Windows Device Manager for unknown devices with a yellow exclamation mark will help diagnose the driver problem.

Using ADB and Fastboot for advanced tasks

Once you have successfully configured security and validated your rights, your smartphone is ready to interact with the command line. ADB allows you to execute hundreds of commands, from a simple screenshot to uninstall system applications. To get started, you need to download Platform Tools from the official Android developer site and unpack the archive on your computer.

To check the connection, open the command line in the tool folder and enter the command adb devices. If the setup is successful, you will see your device's serial number and device status. Unauthorized status means you forgot to click "Allow" on your phone screen or did not pass the SMS check.

To go to Fastboot bootloader mode, which is necessary to flash or unlock the bootloader, you can use the adb reboot bootloader command. This is more convenient than clamping physical buttons when you turn on. Remember that in Fastboot mode, debugging over USB is not active, since the low-level boot protocol works.

adb shell pm list packages -3


adb pull /sdcard/DCIM/Camera photo_backup




adb install -r application_name.apk

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