Xiaomi’s MIUI 12-based mobile devices offer a wide range of capabilities for advanced users. One of the key features hidden by default is USB debugging mode, which allows access to system logs, allows you to install applications directly from your computer, and perform complex manipulations of the file system.
Activating this mode is often necessary for app developers, software repair professionals, or enthusiasts who want to install custom software, but the process of incorporating this feature on modern versions of Xiaomi firmware has become more complex and acquires additional layers of security that must be considered.
In this article, we will discuss in detail the algorithm of actions necessary to unlock debugging access, and also discuss the features of the ADB (Android Debug Bridge) on devices with the shell version 12. Understanding these nuances will avoid common errors and potential locking of the device from the manufacturer's servers.
What is required to debug USB and the developer mode
Developer Mode is a hidden partition in Android operating system settings designed to test applications and diagnose hardware. On Xiaomi devices, it also serves as a gateway for smartphone-computer interaction at the deep system level. Without activating this mode, most firmware tools like the Mi Flash Tool or Mi Unlock will not work.
The main purpose of debugging is to be able to send commands from computer to phone in real time, which allows you to read error logs that are not visible to the average user, forcefully delete system applications or install drivers for specific hardware. In addition, it is through this interface that the bootloader is often unlocked, which is a mandatory step for installing third-party recoverers.
⚠️ Attention: Activation of debugging by USB reduces the security of the device, making it vulnerable to connecting to third-party computers.
It is important to understand the difference between simple file transfer and debugging. If you just need to select the file transfer mode in the USB connection notification to copy photos, then the ADB commands require the debugging enabled, which users often confuse when trying to flash the phone through the standard connection mode.
Preparing the device and computer for setting up
Before you start changing system settings, you need to make sure your hardware and software are ready to go. The computer must have a full driver package for Xiaomi devices, as well as the Platform Tools (ADB and Fastboot) toolkit itself. Without properly installed drivers, the system can only see the phone as a charger.
Particular attention should be paid USB-Not all cables support data transmission; many cheap accessories are designed solely for charging. Using high-quality cables with sufficient bandwidth to transmit data is critical for stable connection during debugging.
- 🔌 Make sure that USB-The cable supports data transfer, not just charging.
- 💻 Install current drivers ADB and Fastboot on a personal computer.
- 🔋 Charge your smartphone to at least 60% to avoid being turned off during procedures.
- 🌐 Check the stability of the Internet connection, as some steps require access to Mi servers.
It is also recommended to back up important data in advance. Although debugging activation does not delete information by itself, subsequent actions, such as unlocking the bootloader, are guaranteed to lead to a complete reset of the device (Wipe Data).
☑️ Ready to debug
Activation of the Developer Mode on MIUI 12
The first step in the process is unlocking the hidden developer menu. Unlike standard Android, where you just click on the build number several times, in MIUI 12, this process requires authorization in your Xiaomi account, which is done to improve security and link actions to a specific user.
Go to the settings menu and select About. Here you need to find the "MIUI version" line and quickly click on it 7-10 times in a row. However, unlike the older versions, the system can request confirmation through entering a password from your Mi Account. If the account is not tied, you need to add it to the "Accounts and syncs" section.
Once you've done the work successfully, you'll see a pop-up notification that you've become a developer, and now you'll see a new "Developers" item in the main settings menu, "Additional" section, and that's where all the tools you need to fine-tune the system are.
Enabling debugging over USB and setting permissions
Once you log into the Developer menu, find the USB Debugging Switch, and when you try to activate it, the system will give you a warning about the risks associated with accessing data, you have to agree to the terms to put the slider in the active position, and at this stage the phone is not yet ready for full-fledged work with the PC.
The next critical step is to set up USB settings. Find the default USB configuration and select File Transfer (MTP) or USB Debugging mode, which ensures that when you connect the cable, the computer will try to establish a connection for data transfer, not just charging.
When you first connect to a computer with debugging enabled, a request for debugging permission from that computer will appear on the smartphone screen. RSA-Make sure you tick "Always allow from this computer" and click "OK." Without this command confirmation. ADB will be ignored by the device.
| Setup parameter | Recommended value | Impact on work |
|---|---|---|
| USB debugging | Included. | Allows exchange of ADB teams |
| USB configuration | File transfer | Determines the mode of operation of the port when connecting |
| Wi-Fi debugging | Off. | It is safer to keep it off if not in use. |
| Factory unlocking | Off. | Requires a separate procedure through Mi Unlock |
It's worth noting that there's an added protection in MIUI 12, which is that if you plug your phone into a new computer, the system can block data transmission until you unlock the device's screen, and this prevents data from being copied from the locked phone even if debugging is enabled.
Problems with drivers and their solution
The most common problem with setting up is the lack of communication between the PC and the smartphone. Windows Device Manager can display the device as "Unknown Device" or "Android" with a yellow exclamation mark. This means that the operating system cannot identify the type of connection without the correct drivers.
To solve this problem, it is recommended to use the official driver installer from Xiaomi or the universal Google USB Driver package. When manually installed through the Device Manager, select the model of your processor (most often Qualcomm or MediaTek) and specify the path to the driver files. It is important not to confuse the drivers for boot mode (Fastboot) and debugging mode (ADB).
⚠️ Note: Installing drivers from unverified sources can lead to unstable work USB-Use only official repositories or proven tools like Minimal. ADB and Fastboot.
Sometimes it helps to simply reset your debugging settings. In the developer menu, find the "Revoke USB Debugging Permits" button. Then reconnect the cable and confirm the request on the phone screen, which clears the list of previously authorized computers and often solves the "hangover" problem.
Security and additional settings ADB
There are many additional options in the debugging menu that can be useful for advanced users, for example, the "Select App for a Fictitious Location" function allows you to substitute the GPS-However, using such functions requires caution, since some applications can be manipulated and stop working.
The Wi-Fi debugging option, which allows you to connect to your phone without cable if both devices are on the same network, is convenient for wireless debugging, but creates a potential security hole if you're on the network, and always turn it off after you've finished.
- 🛡️ Check the list of authorized computers in the debugging menu regularly.
- 📱 Do not leave the debugging mode on constantly unnecessarily.
- 🔒 Use complex screen lock passwords to protect access to the menu.
- 🚫 Avoid connecting to public charging stations with debugging enabled.
MIUI 12 also has a risk monitoring system, which means that if it detects suspicious activity or attempts to install an application from an unknown source through ADB, it can block the action, part of Xiaomi’s security strategy to protect inexperienced users.