How to reflash Xiaomi smartphone: a complete guide from A to Z

While flashing Xiaomi’s smartphone is a daunting task, a properly executed procedure can bring back a locked device, speed up the system, or add new features through custom firmware. But without training and knowledge of the nuances, the risk of turning the phone into a brick remains high. In this article, we’ll look at all the steps from unlocking the bootloader to installing alternative software, with a focus on security and compatibility with modern Redmi, POCO, and Mi models.

It’s important to understand that firmware is official (from the manufacturer) and informal (custom, from the community). The first restores factory settings and fixes bugs, the second opens access to advanced settings, but deprives you of warranties. We will consider both options, and also tell you how to avoid typical errors, such as incompatibility of MIUI versions with the hardware platform (for example, firmware for the Snapdragon 865 is not suitable for MediaTek Dimensity 1200).

1. Firmware Preparation: What to Do Before Starting

Before you start manipulating the firmware, make sure that all the preliminary steps are followed, which will save time and prevent data loss.

First, back up all your important data. The firmware erases internal memory, and it may be impossible to restore contacts, photos or messages after a failed installation. Use Settings → Google → Backup or third-party utilities like Titanium Backup (requires root rights).

• 📱 Contact (export to) VCF-file)
• 📸 Photo/video (copy to PC or cloud)
• 🔑 Passwords (save from Settings) → Passwords and security)
• 🎮 Save games (use cloud or root managers)

Second, check the device model and the current version of MIUI. This is critical for choosing the right firmware. You can find out the model in Settings → About Phone → Model (for example, Redmi Note 11 Pro 5G codenamed veux). See the version of the software in the same place - in the line MIUI version (for example, MIUI Global 14.0.5).

Make sure battery power > 50% | Download the correct firmware version for your model | Connect the device to your PC with the original cable | Disable the antivirus on your computer (can block files) | Install ADB and Fastboot-->

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If you are running a POCO F5 or a new Redmi, check if the manufacturer is blocking the bootloader for your regional version.Some devices (for example, for the Chinese market) require additional manipulation of the Mi Account.

2 Unlock the bootloader: why it is necessary and how to do it

The bootloader on Xiaomi smartphones is locked by default, a security measure that prevents uncertified software from being installed. To flash the device (especially custom firmware), it needs to be unlocked. The process takes 3 to 7 days due to the Mi Account verification.

Unlocking algorithm:

1. Link the device to your Mi Account in Settings → Xiaomi Account.
2. Activate USB debugging: Settings → About Phone → MIUI version (click 7 times to turn on Developer Mode), then Settings → Additional → Developers → Debugging over USB.
3. Download the Mi Unlock Tool utility from the official Xiaomi website and log in to it.
4. Connect your phone to your PC in Fastboot mode (clip Volume Down + Power when the device is off).
5. Run unlock in the utility and wait for SMS with confirmation (may come in a few days).

⚠️ Note: Unlocking resets the device to factory settings. Also note that some models (such as the Xiaomi 13 Ultra) may have additional restrictions for European regions. If the utility gives an error “Couldn’t unlock”, check if the account is tied to another device with an unlocked bootloader – Xiaomi limits the number of unlocks per account.

Yes, successfully.|No, but I'm planning.|I tried, but there were mistakes.|I don't know what that is.-->

3. Selection of firmware: official vs custom

It's going to help you decide which firmware to install, and compare them. MIUI They are stable and optimized, but often contain ads and restrictions. Custom (like LineageOS, Pixel Experience) offer more freedom, but can deprive you of features like IR-blaster.

For beginners, we recommend starting with the official firmware, which can be downloaded from en.miui.com (choose the Stable version, not the Developer, if you don't need experimental features).

Look for custom firmware on the XDA Developers or 4PDA forums. Check before downloading:

• 🔧 Compatible with your model code name (e.g., alioth for the model) POCO F3).
• 📅 Date of last update (fresh build).
• 💬 User reviews (especially camera or communication bugs).

4.Firmware methods: Fastboot, Recovery and ADB Sideload

There are three main methods of installing firmware on Xiaomi. The choice depends on the type of firmware and the condition of the device.

1. via Fastboot (recommended for official firmware) Suitable if the phone is switched on but not running smoothly.

fastboot flash boot boot.img


fastboot flash system system.img




fastboot flash recovery recovery.img




fastboot reboot

2. via Recovery (for custom firmware) Requires a TWRP or other customized Recovery installed. The firmware file (usually in.zip format) is copied to a memory card and installed via the recovery menu.

3. via ADB Sideload (if the device does not boot) The firmware is downloaded to the phone directly from the PC in recovery mode:

adb sideload rom.zip

⚠️ Note: When running through Fastboot, never interrupt the process during the flashing phase, this can damage the system partition. If the PC is getting stuck on command, wait for a timeout (usually a timeout). 5-10 - Minutes) or check the cable connection. USB-Xiaomi cable – cheap analogues can cause data transmission errors.

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For models running a MediaTek processor (e.g. Redmi Note 12), the SP Flash Tool may be required instead of fastboot. It works with firmware files in.scatter format and requires separate driver configuration.

5. Step-by-step instruction: firmware via Fastboot

Consider the most reliable way to do this, by running the official MIUI through Fastboot, which is a method that can restore a bricked-up device or upgrade to the latest version.

Step. 1. Download the archive with firmware for your model (for example, vega_global_images_14.0.5.0.TLBMIXM_20231204.0000.00_13.0_global) And unpack it in a folder on your PC. flash_all.bat.

Step 2. Connect your phone to your PC in Fastboot mode (Put Volume Down + Power When the device is off). Make sure the drivers are installed (Android Bootloader Interface should be displayed in Device Manager).

Step. 3. Launch it. flash_all.bat I'll be working on the administrator's behalf. 5-15 When it's done, it automatically restarts. The first turn on can last for as long as it's done. 10 minutes - don't interrupt it!

Make sure the device is loaded into MIUI|Check the operation of the sensor and buttons|Connect to Wi-Fi and mobile network|Recover data from backup|Update apps through Google Play-->

6. Install custom firmware: TWRP and Magisk

If you want to install custom firmware (like LineageOS 20), you need a customized TWRP, which you need to flash after unlocking the bootloader, but before installing the firmware itself.

Instructions:

1. Download the image TWRP for your model from twrp.me, for example, twrp-3.7.0_12-veux.img For the Redmi Note 11 Pro 5G).
2. Fastboot: fastboot flash recovery twrp.img fastboot boot twrp.img
3. In TWRP, run Wipe → Format Data (this will remove encryption and prevent errors).
4. Copy the firmware file (.zip) on your phone and install it via Install.
5. Optionally, you can search Magisk for root rights (download the latest version from GitHub).

⚠️ Note: Google Pay may stop working after installing custom firmware due to SafetyNet trigger. To get around this, install Universal SafetyNet Fix and MagiskHide Props Config modules in Magisk. OTA-Update – many custom builds require manual flashing when new versions are released.

7.Typical errors and their solutions

Even with the correct following of the instructions, problems can arise, and here are the most common ways to eliminate them:

• 🚨 Anti-rollback error: This occurs when you try to flash the old version MIUI The solution is to find firmware with the same or higher Anti-rollback number (indicated in the file name, for example, ARBv4).
• 🔌 Device not defined in Fastboot: Check cable, port USB (better USB 2.0 on the back of the PC) and drivers. Try the command fastboot devices - if the list is empty, drivers are not installed.
• 🔄 Bootloop: Most likely, the firmware is incompatible with the device. The solution is to flash the official version through Fastboot with a full reset (flash_all_lock.bat).
• 📵 No network after firmware: Check if the firmware region matches the hardware version of the device. For example, Global firmware on the Chinese model (China) may not support local frequencies 4G.

If the device does not turn on at all (black screen, no reaction to buttons), try the emergency mode EDL. For this you will need a box Qualcomm HS-USB QDLoader 9008 and the utility Mi Flash Pro. This method is more complicated and requires soldering work to connect to test points on the board - it is better to contact the service center.

8.What to do after firmware: optimization and verification

Successful firmware is only half the battle, so to keep the device running smoothly, follow a few additional steps:

1. Update apps through Google Play – this will fix possible version conflicts.
2. Set up energy saving: go to Settings → Battery → Energy saving mode and select Balanced (for custom firmware, manual battery calibration may be required).
3. Check the sensors: run the test in the engineering menu (#4636##) or through the Phone Doctor Plus app.
4. Turn off unnecessary services: in MIUI, it's Settings → Applications → Autostart Management. For custom firmware, use Greenify.

If you've stitched custom firmware, look at performance. Some builds (like Pixel Experience) may warm up more than standard MIUI due to lack of optimization for the Xiaomi processor, in which case try the FrancoKernel kernel or roll back to official software.

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After firmware custom software be sure to check the module NFC and IR-These features are often broken due to the lack of proprietary drivers in unofficial builds.

FAQ: Answers to Frequent Questions