Why you should use Xiaomi on Fastboot and when you need it
Fastboot is not just an alternative to standard air-to-air updates (OTAs), but it is a powerful tool that allows you to bring back the brick after a failed upgrade, change the region of the device, remove preinstalled software, or install custom firmware like LineageOS or Pixel recovery Experience. Unlike the method, the Fastboot works at the bootloader level, which gives you complete control over the memory partitions of the device.
When should you use this method? First, if your Redmi Note 12 or POCO F5 It stopped loading after experimenting with Magisk or unofficial cores. MIUI due to bugs in the latest update (e.g., with the MIUI 15. MIUI Third, Fastboot is the only way to install global firmware on the Chinese version of the smartphone if the manufacturer has blocked the device. OTA-transition.
But there is a downside: the process requires unlocking the bootloader, which resets the device to factory settings and can void the warranty. In addition, a bug in the firmware stage can turn the smartphone into a “brick” without recovery. So before you start, check whether your Xiaomi model supports unlocking the bootloader through the official Mi Unlock tool.
Preparation for firmware: what to do before the start
Before you connect your smartphone to your PC, make sure that all the preliminary steps are followed. Their skip is the main cause of errors such as critical partition flashing is not allowed or anti-rollback check fail.
1. Check the model and version of the bootloader. Each Xiaomi model has a unique identifier (for example, toco for Redmi Note 10 Pro). You can find it in the settings (Settings → About Phone → MIUI version, tap on the "Kernel Version" line several times), also write down the current version of MIUI and build number - this will be useful for choosing the right firmware.
2. Data backup. Unlocking the bootloader erases all data, including DCIM photos, messages and accounts. Use Mi Mover or Google Photos for media backup, and for apps and settings, Swift Backup (requires root).
Installation of drivers and tools. The PC must have:
- 🔧 Mi Unlock Tool (official utility for unlocking the bootloader, downloaded from the Xiaomi website)
- 🖥️ ADB and Fastboot (part of Android) SDK Platform Tools by Google)
- 📱 Drivers for your model (if Windows doesn’t recognize your device in Fastboot mode, use the Mi Flash Tool to install them)
I got the code name of the model.|Created a backup of all the data.|I downloaded the official firmware for my model|I got it. ADB/Fastboot Mi Unlock|Prepared the cable. USB (preferably original)-->
Unlocking the bootloader: a step without which you can not do
The bootloader on Xiaomi smartphones is blocked by default. Unlocking it is a prerequisite for firmware through Fastboot.The process takes from 72 hours to 1 week due to the verification of the Mi Account account.
Step-by-step:
- Attach Mi Account to your device: Settings → Xiaomi Account → Sync.
- Activate USB debugging: Settings → About Phone → MIUI version (7 taps per line), then Settings → Additional → For developers → Debugging over USB.
- Connect the smartphone to the PC, confirm the debugging permission.
- Launch the Mi Unlock Tool and log in with the same account as your phone.
- Follow the instructions of the program. Once you send the unlock request, you'll have to wait. SMS-notifications (usually) 3-7 days).
Important: Once unlocked, the device will automatically execute a full wipe. If Mi Unlock gives you a Couldn't unlock error, check:
- 🔄 Is the smartphone connected in Fastboot mode (turn off the device, then pinch the Power) + Loudness down)
- 🕒 Is it 72 hours since the account was linked?
- 📱 Is Chinese firmware used without a global account?
What if Mi Unlock can’t see the device?
Selection of firmware: official vs custom
The type of firmware depends not only on the functionality, but also on the stability of the device. Official firmware from Xiaomi is divided into:
- 🌍 Global (GM) — Internationally, with Google services and support for all languages.
- 🇨🇳 China (CN) — without Google, but with maximum optimization for the hardware.
- 🇪🇺 EEA (Europe – as Global, but subject to European standards (e.g. restrictions on data collection).
- 🇮🇳 India (IN) — adapted to local networks and conditions.
Custom firmware (e.g. LineageOS, ArrowOS) gives more freedom, but requires experience with TWRP and manual patching of vendor partitions. For beginners, we recommend starting with official builds.
Where do I download the firmware?
| Type of firmware | Source | Features |
|---|---|---|
| Official (Fastboot) | miui.com | File name: File name: {model}_global_images_*.tgz |
| Official (Recovery) | Xiaomi Firmware Updater | For updating without unlocking the bootloader. Format:.zip |
| Castomic (AOSP) | XDA Developers | Requires unlocked bootloader and TWRP. Risk of bugs and unstable operation |
| Port from other devices | Developer Telegram channels | Experimental builds. Camera, NFC, or sensors may not work. |
Critical detail: firmware for Xiaomi has anti-rollback protection. MIUI On the device with the new bootloader will lead to a "brick." Check the antirollback number in the name of the firmware file (for example, V13.0.4.0.SKFMIXM_20221114.0000.00_12.0_global, where 12.0 — rollback).
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Before downloading the firmware, check its hash amount (MD5) using the HashMyFiles utility. This will protect you from corrupted files that can interrupt the firmware process.
Step-by-step: Firmware via Fastboot
When the bootloader is unlocked, the firmware is downloaded and the drivers are installed, you can start the main process. Use the Mi Flash Tool (for official firmware) or manual fastboot commands (for custom ones).
Method 1: Mi Flash Tool (recommended for beginners)
- Unpack the archive with the firmware (.tgz →.tar → file folder).
- Start the Mi Flash Tool, select the folder with the firmware.
- Connect your smartphone in Fastboot mode (clip Power + Volume down).
- In the program, press Refresh - the device should appear.
- Select firmware mode: Clean all - complete cleaning (recommended when changing the region) Clean all and lock - cleaning + lock bootloader (only for official firmware!) Save user data - data storage (not always stable)
Flash
Method 2: Fastboot manual commands (for experienced)
If the Mi Flash Tool is making errors, use the following console:
fastboot devices # Check the connection
fastboot getvar product # Checking the device model
fastboot flash boot.img # boot section firmware
fastboot flash system.img # System partition firmware
fastboot flash vendor.img #Firmware vendor-section
fastboot reboot #RebootTo firmware all sections from the firmware folder, use the script:
fastboot flash all -wThe flag -w performs a data reset (analogue of Clean all in Mi Flash).
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If the firmware process has been stuck at the sending 'system' stage for more than 10 minutes, check USB-cable and port. Use the back USB 2.0 - it's more stable than the front USB 3.0.
Common mistakes and their solutions
Even with the correct following of the instructions, errors can occur, and here are the most common ones and ways to fix them:
1. This device is locked error
⚠️ Warning: This error means that the bootloader is not unlocked. Repeat the unlock process through the Mi Unlock Tool. If the utility says Bound to account, but it does not unlock, try it:
- 🔄 Reconnect your Mi Account in your phone settings.
- 📅 Wait 7 full days from the first binding.
- 📱 Use it. SIM-Card that was inserted at the first authorization.
2 Anti-rollback check fail error
⚠️ Note: This error occurs when you try to install firmware with an older anti-rollback number. MIUI Check the number in the firmware file name and on the Xiaomi Firmware Updater website.
3.The device is not defined in Fastboot
- 🔌 Try another one. USB-Cable (original from Xiaomi is preferred).
- 🖥️ Turn off all others. USB-PC-based.
- 🔄 Reinstall drivers manually through Device Manager (select "Android Bootloader Interface").
- 🐧 On Linux, add a rule for udev: sudo nano /etc/udev/rules.d/51-android.rules # Add a line: SUBSYSTEM=="usb", ATTR{idVendor}=="2717", MODE="0666"
4.Hanging on the MI logo after firmware
If the device does not load beyond the logo, try:
- 🔄 Repeat the firmware with full cleaning (Clean all).
- 📱 Install firmware through Fastboot again, but without a flag -w (unless the data is critical).
- 🔧 Just pass it. boot.img and dtbo.img separately: fastboot flash boot boot.img fastboot flash dtbo dtbo.img fastboot reboot
What to do after a successful firmware
Once you first download new software, the device can run slower than usual -- that's OK. It indexes files and optimizes applications. Give the smartphone 10-15 minutes to "stop" before you use it.
1. Set up region and languages. If you've stitched the global firmware on the Chinese model, check:
- 🌐 Region: Settings → Additionally. → Region (Select your country).
- 🗣️ Language: Settings → Language and input.
- 📡 Network: Settings → SIM-maps and mobile networks → Access point (APN) (Manually set up if there is no internet).
2. Data recovery. Don't rush to restore the backup right away!
- 🔒 Make sure the device is loading stably (2-3 reboot).
- 📱 Update all apps through Google Play.
- 🔄 Recover only critical data (contacts, SMS) via Mi Cloud or local backup.
3. Performance check. Test:
- 📶 Mobile communications (calls, SMS, 4G/5G).
- 📷 Camera (main and frontal).
- 🔋 Charging (fast charging should work without overheating).
- 🎵 Speakers and microphone.
- 📍 GPS and sensors (compass, gyroscope).
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