Xiaomi smartphone owners often face a situation where the long-awaited update MIUI 12 doesn't come automatically through the system, it may be due to regional restrictions, order of mailing, or simply a desire to speed up the process of getting new security features. OTA-package, which allows you to force the update process without losing data.
The manual installation procedure requires a certain amount of care and preparation, as interference with system files always carries potential risks. However, if you follow a clear algorithm of actions and use proven file sources, you can successfully upgrade your Mi or Redmi to the current version of the firmware. We will analyze all available methods, from the standard package selection menu to more advanced methods through the computer.
Before you start taking action, you need to understand that OTA-update (Over-The-Air) is an official package distributed by Xiaomi. its installation manually does not require unlocking the bootloader or obtaining superuser rights, which preserves the guarantee on the device, the main thing is to strictly observe the compatibility of versions and the integrity of the downloaded file.
Preparation of the device and downloading the firmware
The first and most important step is to find and download the correct firmware file. An error in this step can lead to the inability to start the device or loss of personal data. You need to know exactly the model of your smartphone and the current version of MIUI to find the appropriate update.
You should only download files from official resources or trusted aggregators such as miui.com or xiaomiui.com. The file should have a.zip extension and weigh between 2 and 4 gigabytes depending on the model. Do not try to use files intended for other regions unless you plan to do a full reset or change region.
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Use a Wi-Fi connection to download firmware, as a file can weigh more than 3GB and quickly exhaust mobile traffic.
Once you download a file, you don't have to unpack or rename it. Just move the archive to the root of the device's internal memory or to the memory card if your model supports it, and the system will find the file when you start the appropriate update mode.
- 📱 Make sure that the battery is at least 60% before the procedure.
- 💾 Free up the minimum 5-8 GB of free space in the internal memory of the smartphone.
- 📂 Copy the firmware file into the root directory without putting it in folders.
- 🔒 Backup important contacts and photos in case of unforeseen crashes.
⚠️ Note: If you downloaded a file for the global version (Global) and you have Chinese firmware (China), installing on top of it without unlocking the bootloader is impossible.
Installation method through the standard Recovery menu
The easiest and safest way to update Xiaomi MIUI 12 manually is to use the built-in update menu, which does not require a computer connection or complex commands. It is suitable for most users who just want to speed up the update.
To start, open the standard Settings app and go to About Phone. Here you need to find the version of the current build, usually the digital bar at the top of the screen. You need to click on this line several times in a row (about 7-10 times) until a pop-up with the message "Additional Features Enabled" appears.
☑️ Pre-installing check
When you activate the hidden menu, you'll see a three-dot icon in the top right corner of the screen, and if you click on it, you'll see "Select a firmware file," and that's where you want to point the way to the previously downloaded zip archive, and the system will check the integrity of the file and, if all is right, suggest you start the process.
The device will reboot and go to Recovery mode, where updates will start. The screen can go out and light up, and the bar will move unevenly — this is normal behavior. The whole process takes from 5 to 15 minutes, depending on the memory speed of the smartphone.
Use of Fastboot Mode and Computer
If the standard method through the menu does not work or gives an error, you can use the Fastboot mode. This method requires a computer with the Windows operating system and a connected computer. USB-It is often used when you need to "flash" the device clean or restore it after a failure.
You'll need the Mi Flash Tool or similar software from Xiaomi to work, and unlike the previous method, it often requires an unpacked firmware archive (.tgz format) to be placed at the root of the C disk for ease of travel. Connect the switched-off smartphone with the volume button to the PC.
fastboot devices
fastboot getvar allThese commands allow you to check the connection and get information about the device, so if the console displays a serial number, then the drivers are installed correctly and you can proceed to the firmware. OTA-Fastboot updates most often require an unlocked bootloader, which is a separate complex procedure.
| Parameter | Recovery Mode | Fastboot Mode |
|---|---|---|
| I need a PC. | No. | Yes. |
| Data retention | Yeah (usually) | Reset required |
| Difficulty | Low. | Tall. |
| Need an unlocked BL | No. | Often. |
⚠️ Warning: Switching from Chinese firmware to global through Fastboot with a locked bootloader is not possible. You will get an anti-rollback error or just a firmware failure.
Engineering menus and hidden commands
Advanced Android users have access to an engineering menu that allows you to manage system parameters more deeply. On Xiaomi devices, this menu is often logged in through a set of special code in the “caller”, but the functionality of this menu is highly dependent on the version of MIUI and the processor of the device.
One of the useful features is the ability to authenticate installed firmware and update status. In some cases, you can find a hidden check for updates button that forcibly polls the server, ignoring standard delay timers. This can help if the update has already come out but has not arrived on your device.
Secret code to check for updates
Using engineering codes requires caution, changing the wrong parameters can lead to unstable operation of the modem or camera, it is recommended to only view the information, but not change the values if you are not 100% sure of their purpose.
- 🔍 Code *#06# will show IMEI and check the integrity of the device data.
- 📡 Code ##4636## opens the testing menu where you can see the network information.
- ⚙️ Code ##6484## launches CIT-iron-testing menu.
- 🔄 Code #778## sometimes gives you access to the advanced update settings.
Solving Common Errors During Updating
The manual installation process is not always smooth, and users often encounter a message that says, “Failure to update” or “File is corrupted,” most of the time it involves mismatching checksums or attempting to roll back to an older version of the system, which is blocked by the Anti-Rollback mechanism.
If installation is interrupted at 99% or 0%, try clearing the Update cache. Go to the application settings, find the updater system application, and select Clear Data.
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The "File is corrupted" error most often means that the file is not fully downloaded or is intended for another model/region.
It’s also worth checking the file system format. If you’re using a microSD card, make sure it’s formatted in FAT32 or exFAT. NTFS files may not be read by the system in recovery mode, leading to a packet search error.
⚠️ Warning: Never try to interrupt the upgrade process by removing the battery or turning off the phone, and this is guaranteed to lead to a “brick” of the device, which can only be restored in the service center.