Why do you want to use Xiaomi 9T and what are the risks?
Firmware of the smartphone Xiaomi Redmi 9T (codename lime, a process that can both revitalize a device and turn it into a brick if you don't get ready. The main reasons users decide to flash flash it back: the desire to install the latest version. MIUI (if official updates no longer come, switch to custom firmware like Pixel Experience or LineageOS for pure Android, or eliminate critical bugs after a failed OTA-update.
However, it is important to understand: firmware via Fastboot or Recovery on Xiaomi 9T It automatically resets user data, including photos in internal memory, if a backup is not made. Moreover, unlocking the bootloader (a mandatory step for custom firmware) cancels the warranty and can lead to blocking the Mi Account account if you do not act correctly. In this article, we will analyze all the stages - from preparation to recovery after a failed firmware - taking into account the specifics of the Redmi model. 9T (Not to be confused with Redmi Note 9T or POCO M3, firmware!).
Preparation for firmware: what to do before the start
Before you start firmware, make sure that all the preliminary steps are followed, and ignoring them is the main reason for the "bricking" of devices, starting with the most important thing:
- 🔋 Battery charge at least 60%, firmware can take up to 30 minutes, and discharging during the process will cause a failure.
- 📱 Backup all data. Use Settings. → The phone. → Backup or third-party utilities like Swift Backup (requires root).
- 🖥️ Windows computer 10/11 (Fastboot firmware. macOS/Linux There may be problems with Qualcomm drivers.
- 🔗 Original. USB-Cheap cables often don't transmit data in Fastboot mode.
Pay special attention to drivers. Redmi 9T will require:
- 🖼️ Drivers. ADB/Fastboot (installed through Minimal ADB and Fastboot or Platform Tools by Google).
- 🔧 Qualcomm drivers HS-USB QDLoader 9008 (required for recovery from the brick").
Make a data backup|Charge the phone. ≥60%|Install ADB/Fastboot driver|Download the correct version of the firmware|Prepare original USB-cable
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If you plan to install custom firmware, be sure to unlock the bootloader through the Mi Unlock Tool. This process can take up to 7 days (due to Xiaomi's policy).
Unlocking the bootloader on Xiaomi 9T: step-by-step instructions
The bootloader on all Xiaomi smartphones is locked by default. Its unlocking is necessary for:
- 📲 Installation of custom firmware (LineageOS, Pixel Experience, etc.).
- 🔓 Getting root rights through Magisk.
- 🛠️ Recovery of the device after serious failures.
The unlocking process consists of several stages:
- Linking your Mi Account to your device: Go to Settings → Xiaomi Account → Mi Cloud and log in. Make sure that the developer settings (Settings → About Phone → MIUI version – tap 7 times) include OEM Unlock and USB Debugging.
- Request permission to unlock: Download Mi Unlock Tool from the official website, log in with the same account as your phone. Connect Redmi 9T in Fastboot mode (press Power + Volume down) and follow the instructions. Please note: Xiaomi may require you to wait 3 to 7 days before unlocking!
- Direct unlock: After the waiting period ends, repeat the process in the Mi Unlock Tool. the device will restart with the bootloader unlocked.
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If the Mi Unlock Tool gives you a "Couldn't unlock" error even after you wait, try using a different version of the program (e.g. 5.5.224.24 instead of the last one) or connect your phone to another version. USB-port (preferably 2.0).
⚠️ Warning: Unlocking the bootloader resets all data on the device, including internal memory, and after this procedure, some functions (for example, Mi Pay or Widevine) are also released. L1 for HD-The streaming may not work properly.
Choosing firmware for Xiaomi 9T: official vs custom
Before you run the firmware, decide which version of the software you want to install. Each version has pros and cons:
| Type of firmware | Advantages | Deficiencies | Recommendations |
|---|---|---|---|
| Official MIUI | Stability, support OTA-Updates, all camera and sensor functions are working | Advertising in system applications, limited customization | The best choice for most users. Download from the official website. |
| Castomic (AOSP) | Clean Android without Bloatware, regular security updates | It may not work. NFC, IR-blaster, encryption | Suitable for power users. Popular options: Pixel Experience, LineageOS 20. |
| Ported MIUI | MIUI functions on unofficial assemblies (e.g., for other regions) | High risk of bugs, no OTA-update | Use only if you need a specific feature (e.g. MIUI EU without ads). |
| Stock (Fastboot) | Recovery of the factory state, treats most software problems | Deletes all data, requires an unlocked bootloader | It is optimal for returning to the original state. |
For Redmi 9T, the official firmware is divided into:
- 🌍 Global (MIUI Global – for the international market, support for Google Services.
- 🇨🇳 China (MIUI China – without Google, but with the latest features.
- 🇪🇺 EEA (European) – as Global, but with due respect GDPR.
- 🇷🇺 Russia – localized for Russia, but updates are less frequent.
Look for custom firmware on the XDA Developers or 4PDA forums. Pay attention to the build date - current versions should be no older than 2-3 months.
Official MIUI| Custom (AOSP)| Ported MIUI without ads | Don't ask, use stock
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Xiaomi 9T firmware via Fastboot: detailed instructions
The Fastboot method is the most reliable way to flash the Redmi 9T, especially if the device is not turning on or stuck on the logo.
- 💻 Computer with installed ADB/Fastboot and drivers.
- 📁 Firmware in.tgz format (for official) or.zip (for custom).
- 🔌 Original. USB-cable.
Step-by-step process:
- Download the firmware: For the official MIUI Choose the desired version on the Xiaomi website (for example, lime_global_images_V12.5.3.0.RJQMIXM_20230315.0000.00_11.0_global). Unpack the archive in a folder with Platform Tools.
- Turn the phone into Fastboot mode: Turn off the device. Press Power + Volume down until the hare appears in the hat-ear (Fastboot logo).
- Connect to your PC and check the connection: In the command line (in the folder with Platform Tools), type: fastboot devices Must appear serial number of the device. If not, check the drivers.
- Start the firmware: For the official MIUI use script flash_all.bat (Windows or flash_all.sh (Linux/macOS). For custom firmware - command: fastboot flash boot boot.img fastboot flash recovery recovery.img fastboot flash system system.img fastboot flash vendor vendor.img fastboot flash dtbo dtbo.img fastboot reboot
⚠️ Note: If the firmware is interrupted with an anti-rollback error, it means you are trying to install an older version. MIUI, In this case, you need to flash the anti-recoil version (see for the first one). 4PDA marked "Anti-Rollback Fix").
What if Fastboot doesn’t see the device?
Firmware through Recovery (TWRP): for custom firmware
If you chose custom firmware (like the Pixel Experience), TWRP Recovery is a must, and it’s only suitable for devices with unlocked bootloaders.
Instructions:
- Install. TWRP: Download the current version TWRP for Redmi 9T (for example, twrp-3.7.0_12-lime.img) Fastboot: Fastboot Flash Recovery twrp.img fastboot reboot recovery
- Backup in TWRP: From the Recovery menu, select Backup and save the Boot, System, Data, Vendor partitions to help restore the phone if something goes wrong.
- Sweat custom firmware: Transfer the.zip firmware file to your phone (via MTP to TWRP or external memory card). In TWRP, select Install, specify the file and confirm the installation. Once completed, run Wipe → Format Data (required!), then restart.
The first run after custom firmware can take up to 10-15 minutes.
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If the phone doesn’t turn on or gets stuck on boot after custom firmware is installed, try flashing the kernel (boot.img) separately through Fastboot or restoring the backup to TWRP.
Solving common errors when firmware Xiaomi 9T
Even with strict adherence to the instructions, errors can occur, and let's consider the most common ways to eliminate them:
| Mistake. | Reason. | Decision |
|---|---|---|
| Fastboot: unknown command | The wrong path to Platform Tools or no administrator rights | Run the command line on behalf of the administrator and check the path to fastboot.exe |
| This package is for "lime" devices; this is a "" | Downloaded firmware for another model (for example, for Redmi Note 9T) | Check the device codename (fastboot getvar product) and download the correct firmware |
| Hanging on the MI logo after firmware | Incompatible kernel (boot.img) or no Format Data in TWRP | Sweat boot.img separately or run Format Data in TWRP |
| Anti-rollback check fail | Trying to stream an older version of MIUI | Find firmware marked “Anti-Rollback Fix” or run a newer version |
| Telphon not defined in Fastboot | Problems with drivers or cable | Try another cable/port, install drivers manually (see spoiler above) |
If the device has turned into a brick (it doesn't turn on, doesn't respond to buttons), don't panic. In most cases, it can be restored via EDL (Emergency Download Mode) mode.
- Download the Mi Flash Tool and EDL firmware (search for 4PDA marked "EDL").
- Connect the phone to the PC by holding Volume up + Volume down, then insert the cable (the device should be defined as Qualcomm HS-USB QDLoader 9008).
- In the Mi Flash Tool, select the downloaded firmware and press Flash.
⚠️ Attention: Regime EDL If you don’t remember your account details or the phone was bought with your hands, it will be extremely difficult to restore it (you need to contact the service center with proof of purchase).
Data recovery and configuration after firmware
After the successful Redmi 9T firmware, you have to return the data and configure the system.
- 🔄 Backup recovery: If you made a backup through TWRP Or Mi Cloud, restore it. TWRP Select Restore and select the folder with the backup. For Mi Cloud, log in to your account and select Restore in the settings.
- 🔐 Security setting: Install PIN-code or pattern lock, enable encryption (if necessary) in Settings → Security: Custom firmware may require additional Magisk setup to run banking applications.
- 📱 Functionality Check: Make sure it works: 📶 Communication modules (Wi-Fi, Bluetooth, mobile network). 📷 All cameras (main, wide-angle, macro). 🔋 Charging and determining the level of the battery. 🎵 Speakers and microphone.
- 🔄 Update of the firmware: For the official MIUI Check for updates in Settings → The phone. → System Update. For custom firmware, follow the updates on the developer forum.
If some functions have stopped working after the firmware (for example, NFC or IR-blaster, it might be related to the custom firmware:
- Check on the firmware forum if this is a known bug.
- Try flashing another firmware option (for example, go from LineageOS to Pixel Experience).
- Install additional fixes (for example, NFC_fix.zip), if available.
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If Google Pay or other banking applications are not working after custom firmware is installed, install Magisk and activate the Universal SafetyNet Fix module. Then hide the root rights for these applications through MagiskHide (the newer versions of Magisk are called DenyList).