Update Xiaomi Mi Max 3 to MIUI 12: detailed guide

Owners of the popular Xiaomi Mi Max 3 phablet often wonder about the possibility of switching to a fresher shell MIUI 12. Despite the fact that the device was released a few years ago, its powerful hardware is quite capable of pulling modern interface solutions of the manufacturer.

There are several ways to install new firmware, each with its own advantages and risks, and in this article we will detail the algorithms of actions so that you can safely and efficiently upgrade your smartphone software, gaining access to new features and improved security.

Before you start taking action, you should objectively assess the current state of your gadget. System updates are a serious process that affects the system partition of memory, so preparation plays a critical role in the success of the entire operation.

Preparation of the device and compatibility check

The first step is to determine the exact model of your device. Xiaomi Mi Max 3 has several modifications, and installing firmware from another version can cause communication modules to fail. You can check the exact model in the Settings → About Phone section, where the model code is indicated, for example, M1805E10A.

It’s important to make sure that the bootloader is unlocked if you plan to use advanced installation methods. This isn’t always necessary for a standard upgrade via Recovery, but having an unlocked Bootloader greatly enhances recovery options in the event of a crash.

A prerequisite is that there is enough free space in the internal memory. The firmware files weigh between 2 and 4 gigabytes, plus the system requires space for temporary files during the unpacking and installation process. Clearing the cache and removing unnecessary media files will help avoid errors with the code "Not enough space".

A stable internet connection is another key factor, especially if you download a system image directly to your smartphone.Bringing the download can damage the archive, causing a checksum error when you try to install.

Backup of data before firmware

Any interference with the system partition carries a potential risk of loss of user data, and even if the procedure is normal, a power failure or software error can lead to the need for a complete reset, which is why making a full copy of the information is the number one priority.

The easiest way to save contacts and notes is to sync with Mi Cloud or Google account, and to do so, go to your account settings and make sure that all the necessary items are marked for sync, and once you log in to your account on any device, your data will be automatically restored.

To save photos, videos and documents, it is better to use an external drive or computer. USB-cable-in-file transfer mode (MTP) and copy the folders. DCIM, Pictures and Download on hard drive. It takes time, but it guarantees the safety of personal archives.

WhatsApp, Telegram and Viber store correspondence locally or in the cloud services, which must be activated manually in the settings of each application. Don’t rely on automatic synchronization, but forcefully create a backup right before the procedure begins.

Official method of updating through the phone menu

The safest and most recommended way for most users is to use the built-in update mechanism. The system itself checks for a new version of the software for a particular model and region. To start the process, go to Settings → About Phone → MIUI version.

Click on the update check button. If MIUI 12 is already available in your region, the system will prompt you to download the package. The download speed depends on Xiaomi servers and the quality of your connection. In some cases, the update can come in waves, so be patient.

After downloading a file of about 2.5 GB, the phone will suggest restarting for installation. the process will take from 5 to 15 minutes, during which the Xiaomi logo and progress bar will be displayed on the screen.

In the event of installation errors such as “Can’t verify update”, the system will prompt you to select files manually, which may mean that the signature of the downloaded file does not match the current version, and you will need to use the method through a computer or Recovery.

Manual installation of firmware through Recovery

If the automatic update does not work, you can use the manual method. To do this, you need to download the current firmware archive Recovery ROM for Xiaomi Mi Max 3 from the official website or a proven resource. The file must have the.zip extension and weigh about 2-3 gigabytes.

Copy the downloaded file to the root of the smartphone's internal memory. Don't put it in folders, use the root directory to make it easier to find. Then go to the update menu and click on the three dots in the top right corner of the screen.

Select "Select a firmware file" and specify the previously downloaded file. The system will check compatibility. If everything goes well, the installation process will begin, similar to automatic updating. OTA-update.

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Use quality. USB-cable when connected to a PC to transfer files to avoid damaging the firmware archive during the copying process.

Using the Mi Flash Tool for clean installation

For users who want to perform a clean installation without saving debris from older versions, the Mi Flash Tool is suitable. This method requires an unlocked bootloader and the presence of ADB drivers on the computer. Download Fastboot ROM, which has the extension.tgz.

Unpack the firmware archive on your computer. The path to the folder should not contain Cyrillic characters or spaces, otherwise the installation script may not work. Run the Mi Flash Tool on behalf of the administrator and connect the phone in Fastboot mode.

In Fastboot mode, the phone screen usually displays the logo of a hare repairing an android, or the words Fastboot. In the utility, select the path to the unpacked folder and press the Flash button. It is important to select the "Clean all" mode to avoid file conflicts.

⚠️ Warning: When you select Clean All mode, all data on your phone will be permanently deleted.

The process of firmware through Fastboot takes longer, as it formats the memory partitions. Don't turn off the cable until the message of successful completion appears. Once you restart, the system will be completely clean, as after you buy.

Solving Typical Errors and Problems

Users may encounter various difficulties during the upgrade process, one of the most common being the “Zip signature verification failed” error, which occurs when trying to install global firmware over Chinese or vice versa, or when switching between major versions of Android (for example, 8 to 10) without intermediate steps.

Another common problem is getting stuck on the logo after installation, which is when you go into Recovery mode and reset Wipe Data, which will delete user data but restore the system to work.

If the phone stopped responding to buttons and didn’t turn on, it could be a bootloader damage, which can only be done by flashing the Mi Flash Tool in EDL mode, which often requires an authorized account or paid services.

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Switching between regional versions (CN to Global) almost always requires a complete data cleanup and unlocked bootloader.

Optimizing the system after updating

Once MIUI 12 is successfully installed, the system begins the application background optimization, which can take anywhere from 30 minutes to several hours, during which time the phone can heat up and consume more charge, a normal process of file re-indexing.

Remove old app caches that may have been left over from the previous OS. Go to the storage settings and clear the system services cache. It’s also worth checking the permissions for applications, as the new version of the shell may have reset some privacy settings.

Update all apps through Google Play Market and Mi GetApps. Developers often release compatibility patches for newer versions of Android and shells. Current versions of programs are more stable and consume less power.