Reflashing the Xiaomi Redmi Note 12 may be necessary to install a fresh version of MIUI, switch to custom firmware (such as LineageOS or Pixel Experience), or to restore functionality after a failure. However, the process has nuances, from unlocking the bootloader to choosing the right version of software for your modification (Redmi Note 12 4G/5G/Pro/Pro+).
In this article, we'll look at all the current ways to flash Redmi Note 12 in 2026, through Fastboot, Recovery, and tools like the Mi Flash Tool and OrangeFox Recovery. We'll focus on training, from backing up data to checking the firmware compatibility with your model. If you're a beginner, start with the official methods; experienced users will find advanced techniques here.
⚠️ Warning: Flashing will void Xiaomi's warranty and could lead to data loss.Clocked bootloader models will require official unlocking via Mi Unlock Tool, which takes up to 720 hours of latency (under Xiaomi 2023 rules).
Preparation for Flashing: What to Do Before Starting
Before you start the procedure, make sure you follow all the preliminary steps, which minimizes the risks and simplifies the process.
First, determine the exact model of your Redmi Note 12. To do this, go to Settings → About Phone → Model. The devices in the series differ in processors and support for networks:
- 📱 Redmi Note 12 4G — sweet (Snapdragon 685)
- 📱 Redmi Note 12 5G — tapas (Snapdragon 4 Gen 1)
- 📱 Redmi Note 12 Pro/Pro+ 5G — ruby (Dimensity 1080/1200)
Code name
Next, check out the current version of MIUI in Settings → About Phone → MIUI version. If you plan to upgrade to custom firmware, make sure it supports your Android version (e.g. Redmi Note 12 5G out of the box runs on Android 12, but Android 14 ports are already available).
Make a backup copy of the data (photos, contacts, messages)
Charge your phone at least 60%
Download Xiaomi drivers for PC (Qualcomm/QDLoader)
Make sure the original is available USB-cable (not wireless charging!)
Disable Mi Account protection (if you plan to unlock the bootloader)
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⚠️ Note: If your Redmi Note 12 is purchased in China (market version) CN), Global (Global) or European firmware (EEA) version MIUI can block the network due to differences in modem software, in which case a patch will be required for NVRAM.
Official firmware through Recovery: the safest method
This method is suitable for updating MIUI without unlocking the bootloader. It stores user data, but requires an official service pack in.zip format.
Download the latest stable firmware for your model from the official Xiaomi Firmware website. Choose a version marked Recovery (not Fastboot!). 12 Pro+ 5G (ruby) it's going to be a file of the form miui_RUBYGlobal_V14.0.5.0.TMOMIXM_....
Installation instructions:
- Copy the downloaded.zip file into the root folder of the phone’s internal memory (not into the folder!).
- Go to Settings → About the phone → System update.
- Click on the three dots in the upper right corner and select Select the firmware file.
- Specify the downloaded file and confirm the installation.
- After restarting, the phone will be updated automatically (it will take 5-10 minutes).
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If the phone is stuck on the MI logo after the update via Recovery, wait 15-20 minutes. If the freeze continues, reset via Fastboot with the command fastboot erase userdata (data will be deleted!).
⚠️ Warning: Do not interrupt the update process, even if the phone appears to be frozen. During the verification update package, the system checks the integrity of the file - this can take up to 5 minutes.
Unlocking the bootloader: a must-do step for Fastboot and custom firmware
Xiaomi
Redmi Note 12
Fastboot
Recovery
TWRP
30 days
Xiaomi
Steps to unlock:
- Link your Mi Account to your phone at Settings → Xiaomi Account.
- Enable USB Debugging and OEM Unlocking in Settings → For Developers (activated by 7 single clicks on the MIUI version).
- Download the Mi Unlock Tool and install it on PC.
- Connect your phone to your PC in Fastboot mode (turn off the device, then press Power + Vol−).
- Launch the Mi Unlock Tool, log in to your Mi Account and follow the instructions. When you first connect, the tool will show a waiting timer (usually 168 or 720 hours).
After the waiting period has expired, repeat the procedure - the bootloader will be unlocked.
- 🔌 Use the original cable USB Type-C (cheap cables can cause errors).
- 🖥️ On the PC installed drivers Qualcomm HS-USB QDLoader 9008 (for Snapdragon models) or MediaTek Preloader (for Dimensity).
- 📱 The phone was not bought on the secondary market with someone else’s Mi Account tied (this will block unlocking).
What to do if the Mi Unlock Tool shows a "Couldn't unlock" error?If after waiting, the tool refuses to unlock the bootloader, try it.
Fastboot Firmware: Complete Reinstallation of MIUI
Fastboot allows you to install the official firmware from scratch, which is useful for serious crashes or switching between regional versions of MIUI (for example, from CN to Global).
Download Fastboot firmware for your model from the site Xiaomi Firmware Updater. the file will be in the archive.tgz - unpack it in a folder without Cyrillic characters (for example, C:\MIUI\ruby_global).
Firmware instructions:
- Install the Mi Flash Tool on your PC.
- Turn the phone into Fastboot mode (turn off, then press Power + Vol−).
- Connect the device to your PC and check for driver detection (Android Bootloader Interface should be displayed in Device Manager).
- In the Mi Flash Tool, click Select and specify the folder with the unpacked firmware.
- Select firmware mode: Clean all - complete cleaning (recommended when changing the regional version); Clean all and lock - cleaning + lock bootloader (only for official firmware!); Save user data - data storage (not always stable).
Flash
| Mistake. | Reason. | Decision |
|---|---|---|
| flash_write_failed | Problems with the USB cable or port | Try another cable/port, turn off USB-hub |
| anti_rollback check fail | Reversed to an older version of MIUI | Use firmware no older than the current version of Android |
| device not found | Drivers not installed or phone not in Fastboot mode | Check the connection, reinstall the drivers |
| invalid sparse file | Firmware file damaged | Download the firmware again, check the checksum MD5 |
⚠️ Note: If you are using Redmi Note 12 with a Dimensity processor (models) Pro/Pro+), Use the Mi Flash Tool version 2020.3.14.0 Older versions don't support MediaTek chips.
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Fastboot is the only way to reanimate a phone if it doesn’t turn on or is stuck on a logo, but it completely erases data, including internal memory (if you choose Clean all).
Installation of custom firmware: TWRP and alternative OS
For enthusiasts wanting to install LineageOS, Pixel Experience or other custom firmware, custom Recovery (such as TWRP or OrangeFox) is more complicated than official firmware and requires an unlocked bootloader.
Download it first.
- 📱 Castomic Recovery for your model (e.g, TWRP For the Redmi Note 12 Pro 5G).
- 📱.zip firmware (check compatibility with the device code name!).
- 📱 Magisk (optional, for root rights) – the latest version from GitHub.
Installation instructions:
- Transfer the phone to Fastboot mode and connect to the PC.
- Recovery: Fastboot Flash Recovery twrp-3.7.0_12-ruby.img Fastboot Reboot Recovery (replace ruby with your model’s code name).
- In TWRP, run Wipe → Format Data (required for custom firmware!).
- Transfer your firmware and Magisk files to your phone via MTP (TWRP has Mount → Enable MTP option).
- Install the firmware through Install → Select Zip, then repeat for Magisk (if you need a root).
- Reboot → System: The first launch can take up to 15 minutes.
⚠️ Attention: On the Redmi Note 12 Android 13/14 Some custom firmware may not support data encryption (FBE). If after installation, the phone asks for a password, but does not accept it, try formatting data into the phone. TWRP with the option of Format Data as F2FS.