Owners of Xiaomi smartphones often face a situation where the official update to the new version of the operating system does not come to the device, although technically the device is able to work more stable. Android 12 brought many visual changes and improvements in the MiUI 13 and HyperOS, which makes the desire of users to update the software quite justified. The process of installing a new firmware can vary from simple checking settings to a complex procedure for flashing through the computer.
Before you start taking action, you need to clearly understand the model of your gadget and the current version of Bootloader. Some models, such as the Xiaomi Mi 9 or Redmi Note 8 Pro, have already received global updates, while other versions of the software will have to be installed manually. Ignoring the preparatory stage can lead to data loss or, in the worst case, to the transformation of the smartphone into a “brick”.
In this article, we will take a look at all the available methods, from regular air upgrades to the Mi Flash Tool. You will learn how to prepare the device, what files you will need and how to avoid common errors. Careful follow the instructions will allow you to safely access new features and increased security of the system.
Compatibility check and device preparation
The first and most critical step is to determine the exact model of your device and check the list of supported versions. Not all smartphones in the line of Redmi or Poco have official ports on the Android 12 base. You need to go to Settings → About phone and rewrite the model number, for example, M2007J20CG. This code will be used in the future to search for the right firmware.
The next step is to free up space and back up. Installing a new system requires free space, often larger than the size of the firmware archive itself, because the system needs space for temporary files. Backup is not just a recommendation, it's a requirement, because in the process of changing the version of Android, data can be completely destroyed.
It is also important to charge the device battery to a minimum of 60-70%, the process of firmware power consumption, and a sudden power outage at the time of writing system partitions can disrupt the structure of the file system. Make sure that the USB cable you plan to use is healthy and capable of transmitting data, and not only charging the gadget.
Unlocking the bootloader: a necessity or option
Many users are wondering whether it is necessary to unlock Bootloader to install Android 12. If you plan to install a global firmware version on top of Chinese or change the region, then unlocking BL is mandatory. Without this procedure, the system will give a signature verification error and refuse to install the service pack.
The unlocking process requires filing an application through the Mi Unlock app and waiting between 7 and 168 hours, which is the time Xiaomi needs to verify the legitimacy of the device, during which time you can not reset your phone settings or log out of your Mi Account, otherwise the timer will reset and the wait will begin again.
Risks of unlocking the loader
It’s worth noting that unlocking the bootloader automatically triggers the Wipe Data process. So if you haven’t already done a backup of photos and contacts, do it right now. Once unlocked, the phone will look like you just pulled it out of the box.
How to install Android 12: OTA, Recovery and Fastboot
There are three main methods of updating, each with its own characteristics and scope, and the choice of the specific method depends on the current state of your smartphone and the desired result.
- 🔄 OTA (Over-The-Air: A regular update via the settings menu, the safest, but often comes with a delay.
- 📦 Recovery Mode: Manual installation of firmware archive through built-in recovery menu, suitable for changing region.
- 💻 Fastboot: Complete Flashing Through Computer Using Cable USB, It allows you to change the Android version and the language of the system.
OTA is preferred for ordinary users because it eliminates the risk of human error. However, if Xiaomi servers do not offer an update to your model, you have to resort to more complex methods. Fastboot method gives maximum control, allowing you to install the system completely, but requires the presence of ADB and Fastboot drivers on the PC.
☑️ Hand-made firmware readiness
Step-by-step: installation through Recovery
This method is suitable if you already have a firmware file in.zip format and want to upgrade without using a computer. First download the current firmware for your model from a proven resource, for example, Xiaomi Firmware Updater.
Next, go to Settings → About Phone and click on the MiUI version several times to activate the optional menu. Click on three dots in the corner of the screen and select Select the firmware file. Find the downloaded archive and confirm the action. The phone will restart and begin the installation process.
⚠️ Warning: If you’re trying to roll back on an older version of Android or switch from region (from China to Global), standard Recovery will give you an error, in which case only Fastboot mode or custom recovery will help. TWRP.
Once installed, the device will restart. The first launch can take up to 10-15 minutes as the system optimizes applications. Don't panic if the screen is lit with the MI or Android logo for a long time - this is normal behavior when a major update is made.
Full Fastboot and Mi Flash Tool
For those who want to be guaranteed to deliver Android 12, even if the official update is not available, the Fastboot method is suitable. You will need to download the firmware image with the.tgz extension and unpack it, and you will need to install the Mi Flash Tool program and Qualcomm or MediaTek drivers on your computer.
Turn off your phone and press the volume and power button at the same time to enter Fastboot mode (there will be a bunny in a hat-eared hat on the screen). Connect your smartphone to your PC and launch the Mi Flash Tool. The program must identify the device. Choose the path to the unpacked firmware and press the Flash button.
fastboot devices
fastboot flash recovery recovery.img
fastboot rebootIt is important to choose the right firmware mode in the utility: Clean All will delete the data completely, Save User Data will try to save it, but can cause errors when changing the Android version. To upgrade to Android 12 from older versions, it is strongly recommended to choose a full cleanup.
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Use it. USB-port built directly into the computer motherboard (back of the system unit), rather than the front panel ports or USB-This will ensure stable voltage and data transmission, reducing the risk of firmware error.
Compatibility table of popular models
Not all devices support the Android 12 transition officially, and here is a status table for popular models to let you know what to expect.
| Model of the device | Official support | Type of firmware | Stability |
|---|---|---|---|
| Xiaomi Mi 11 | Yes. | Global / CN | Tall. |
| Poco X3 NFC | Yes. | Global | Medium |
| Redmi Note 9 Pro | Yes. | Global | Tall. |
| Xiaomi Mi 8 | No (only Custom) | Custom ROM | Low. |
For models that don’t have official support (like the Mi 8 in the table), there are custom firmware such as LineageOS or Pixel Experience. Their installation requires an unlocked bootloader and installing a custom TWRP recavator. This is the way for power users willing to put up with possible camera or NFC bugs.
Solving problems and errors in the update
Errors can occur during the installation process, such as Error 7 in Recovery or a logo hover. Error 7 usually means the version of the bootloader and firmware is incompatible. The solution is one - update in stages without jumping over major versions of Android, or use the Fastboot method with data cleaning.
If the phone is gone to Bootloop, try recovery mode (pressing the power and volume up) and do Wipe Data/Factory Reset. If that doesn't work, you'll need to flash it over Fastboot. In rare cases, only service center and resolding of memory helps, but this is extremely rare when following instructions.
⚠️ Warning: Never interrupt the firmware process by disconnecting the cable or turning off the computer. Interrupting the system partition or boot is almost guaranteed to make the device impossible to boot.
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The safest way for an inexperienced user is to wait for the official OTA-Manual methods carry risks and require technical literacy.