How to Install Fastboot on Xiaomi: A Complete Guide to Unlocking the bootloader

Installing Fastboot on Xiaomi smartphones is a must for those who want to gain full control of the device, which allows you to flash custom recovery, install informal firmware or restore the phone after serious failures. However, many users face problems already at the stage of unlocking the bootloader or connecting the device to the PC. In this article, we will discuss a unique algorithm for Xiaomi 2023-2026, taking into account the latest changes in the company’s policy and the features of new models like the Redmi Note 13 Pro+ or Xiaomi 14.

It is important to understand that the procedure is different from the standard ADB installation: it requires official permission from Xiaomi to unlock the bootloader, without which further manipulation is impossible. We will describe in detail each step - from preparing drivers to entering commands in the terminal - and also warn against typical errors that can turn your smartphone into a "brick." If you are a beginner, we recommend you to carefully follow the instructions and not to miss the sections with warnings.

What is Fastboot and Why You Need It on Xiaomi

Fastboot is an interaction protocol with the Android device bootloader that allows you to perform low-level operations through the use of a mobile device. USB-Unlike Recovery mode, where capabilities are limited to standard functions, Fastboot gives access to the computer:

• 🔓 Unlock the bootloader (bootloader unlock), necessary for installing custom firmware;
• 📱 Firmware of official and informal images MIUI or AOSP;
• 🔧 Recovery of the device after a "soft" or "hard" breech;
• 🛠️ Installation of modified kernels, recovery (TWRP) or Magisk patches.

On Xiaomi smartphones (including Redmi and POCO sub-brands), Fastboot is integrated into the system, but is blocked by default.This is due to the company's security policy, which seeks to prevent unauthorized changes to the firmware. However, once the bootloader is officially unlocked, you get full access to the mode's features.

⚠️ Warning: Unlocking the bootloader resets all data on the device, including photos, contacts and installed apps, and it may also take away your warranty if the device was purchased less than a year ago.

For Xiaomi 2020 and newer models (e.g. Redmi K50, Xiaomi 12T) the process is complicated by additional checks of the Mi Account.

Preparation for installation: requirements and warnings

Before you switch to Fastboot, you need to follow several critical steps, and neglecting them can lead to data loss or the inability to unlock.

Minimum requirements:

• 💻 Computer running Windows 10/11 (for Mac/Linux Additional drivers will be required);
• 🔌 Original. USB-cable (better from the delivery package);
• 📱 Battery charge of at least 60%;
• 🔐 Mi Account linked to the device (required to have a confirmed phone number!).

What to do in advance:

1. Create a backup of data through Settings → About Phone → Backup;
2. Make sure the device has the latest version of MIUI installed (update via Settings → System Update);
3. Disable Find My Device in your Mi Account settings
4. Download Mi Unlock Tool (official unlocking software).

⚠️ Attention: On Xiaomi models 13/14 series and Redmi Note 12 Turbo account binding to the device must be performed for 72 Otherwise, the Mi Unlock tool will give you an error called "Couldn't unlock".

Also check if your model is officially supported. For example, devices for the Chinese market (with the CN suffix in the title) may have limitations. The full list of compatible models is available on Xiaomi's official website.

Installation of drivers and configuration ADB/Fastboot PC-only

Without properly installed drivers, your computer will not be able to recognize the device in Fastboot mode. Follow the instructions below to avoid “device not found” errors.

Step 1 Install ADB and Fastboot:

1. Download Platform Tools from Google (official package with adb and fastboot);
2. Unpack the archive to the root of the C:\ disk (e.g., C:\platform-tools\).
3. Add a path to the folder to the environment variables: Open Control Panel → System → Additional System Parameters → Environment Variables; In Path, add the line C:\platform-tools\.

Step 2: Installation of drivers for Xiaomi:

• 🔧 Download the Mi Flash Tool (includes drivers for Fastboot);
• 🖥️ Connect the off smartphone to the PC, keeping Volume down + Meals to enter the Fastboot;
• 🔄 In Device Manager, find the device with the exclamation mark (usually "Android Bootloader Interface") and update the driver manually, indicating the path to the folder with the Mi Flash Tool.

Check the functionality of the connection by performing in the command line:

fastboot devices

If you see the serial number of the device (for example, 1234abcd fastboot) in response, the drivers are installed correctly.

💡

If the fastboot device command doesn’t show the device, try using another one. USB-port (preferably) USB 2.0) or disable the antivirus, which may block the connection.

Unlock the bootloader with the Mi Unlock Tool

This is the most crucial step. Xiaomi has introduced additional checks for new models, so follow the instructions carefully.

Step 1. Linking your account to your device:

1. Turn on USB debugging: Settings → About Phone → MIUI version (click 7 times until the message “You became a developer” appears);
2. Return to Settings → Additional → For developers and activate: Debugging by USB; Unlocking OEM (on some models this item may not be available).

Connect the phone to the PC and confirm the debugging permission.

Step 2. Launch the Mi Unlock Tool:

• 📥 Download the latest version of the Mi Unlock Tool;
• 🔓 Run the program on behalf of the administrator and log in under the same Mi Account as on your phone;
• 📱 Transfer the device to Fastboot (Loudness down) + Power) and connect to the PC;
• 🔍 In Mi Unlock Tool, press Unlock and wait until the process is completed (usually takes 1-5 minutes).

The phone will display a data reset warning, confirm the action, and once successfully unlocked, the device will automatically restart.

⚠️ Note: If the Mi Unlock Tool gives an error "Couldn't unlock. Wait 168 hours", it means that you have previously tried to unlock the bootloader and must wait 7 days.

Mi Account linked to device | USB | Installed Fastboot | Downloaded Mi Unlock Tool latest version | Battery charge >60%-->

Main Fastboot teams for Xiaomi

Once you unlock the bootloader, you can use the Fastboot for various operations. Below are the most requested commands with explanations.

To run the official MIUI via Fastboot, use the command:

fastboot flash all firmware.zip

Where firmware.zip is a firmware file downloaded from xiaomifirmwareupdater.com.

Important: On models with a super partition (for example, Xiaomi 12 Pro), instead of flash all use:

fastboot update firmware.zip

Solving Common Mistakes in Fastboot

Even with accurate follow-up, users often encounter errors, and let's look at the most common ones and how to fix them.

Error "waiting for any device":

• 🔌 Problem: PC does not see the device in Fastboot mode.
• 🔧 Solution: Check the cable connection (try the port) USB 2.0); Reinstall drivers via Device Manager; disable antivirus (it can block adb).

2. Mistake "FAILED (remote: 'Flashing is not allowed in Lock State')":

• 🔒 Problem: The bootloader is not unlocked.
• 🔓 Solution: Unlock the procedure through the Mi Unlock Tool (see section above).

Error "Invalid sparse file format at header":

• 📁 Problem: The firmware file is damaged.
• 🔄 Solution: Download the firmware again and check the checksum (MD5).

4. The device hung on the Mi logo after firmware:

• 🛑 Problem: Incompatible firmware version or interrupted process.
• 🔧 Solution: Try booting up to Fastboot (Loudness Down) + Power) and flash the official firmware; if the device does not respond, use the Mi Flash Tool in "clean all" mode".

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If the device doesn’t turn on after the firmware is installed, DO NOT try to flash it again without a diagnosis. First, check if it responds to the connection to the PC (USB connection sound, Device Manager detects).

Security and recommendations after installing Fastboot

Successful unlocking the bootloader and working with Fastboot opens up opportunities, but also carries risks.

Backup:

• 📱 After unlocking immediately create a backup through TWRP Mi Backup;
• 💾 Keep a copy of the persist section (responsible for IMEI and serial numbers).

Firmware updates:

• 📲 Use Fastboot to Fastboot Full Update to Avoid Blocking.

3.Brick protection:

• 🛡️ Do not flash files that are intended for other models (even if they are similar in name);
• 🔍 Check the firmware before you run it. MD5-file;
• 📡 Use stable versions TWRP For your model (verified sources: twrp.me).

Remember: an unlocked bootloader makes your device more vulnerable to malware. Install applications only from trusted sources and regularly check the system for viruses.

FAQ: Frequent questions about Fastboot on Xiaomi