How to upgrade to Android Xiaomi Mi 9T: Full Guide

The Xiaomi Mi 9T, known in some regions as the Redmi K20, remains a popular device due to its powerful processor and high-quality display, but owners often face the question of the relevance of the software. Updating the operating system is not just a change of numbers in settings, but a critical process to ensure the security of personal data and stability of the gadget. Many users postpone this step for fear of losing data or encountering errors, but the right approach reduces all risks to a minimum.

There are several ways to update software, from standard automatic updates to manually installing archives through a special Recovery menu. The method you choose depends on the current version of the system, the region of the device and the goals you are pursuing. If the automatic method does not offer a new version, it does not mean that it does not exist - sometimes manual intervention is required to move between global versions or regions.

In this article, we will take a look at all the preparation and execution stages to make your Xiaomi Mi 9T work at maximum performance, we will look at the nuances of the transition to new versions of MIUI and even touch on the topic of experimental builds, explaining the difference between stable and beta versions.

Preparing the device for system update

Before any software manipulations begin, a number of preparatory steps must be taken to ensure the success of the operation. The first step is to make sure that the battery is at least 60% power, since the firmware process is energy intensive and a sudden power outage can lead to serious consequences. It is also critical to create a full backup of all important data, including contacts, photos and messages, using cloud services or local storage.

Free up enough internal memory, as the installation file can take up 2 to 4 GB of free space depending on the version, it is recommended to remove unnecessary applications or temporarily transfer heavy files to a computer or memory card if the model supports its use through an adapter.

⚠️ Attention: Ignoring the requirement for a sufficient battery level can lead to the fact that the smartphone will go into a reboot cycle and require a difficult recovery through the computer.

Check the stability of the Internet connection if you plan to download the update directly to the device. Using Wi-Fi networks can be risky due to the possible loss of signal in, so it is better to use a home network or a personal access point with good coverage.

Automatic updates via MIUI settings

The easiest and safest method for most users is to use the built-in update mechanism. The system itself checks the servers for new versions and suggests installing them if your device meets the rollout criteria. To start the process, go to the Settings → About Phone menu and click on the MIUI version logo.

If the new version is available, you will see a Download and Install button. Once you have finished downloading, the system will suggest a reboot, during which the files will be installed, preferably because it stores all user data and settings without having to reconfigure them.

However, sometimes it happens that the update comes with a delay due to the phased distribution, in which case you can try to click on the three dots in the upper right corner of the screen and select "Select firmware file" if you already have a downloaded archive. But for the standard scenario, just wait for notification or check for updates manually every few days.

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If the update button is inactive, try changing the region in the settings (for example, India or Global), check for a new version, and then return the original region.

It is worth noting that the automatic updater often checks the integrity of digital signatures, which prevents the installation of modified or corrupted files, an important security aspect that protects users from introducing malicious code through the update system.

Manual installation of firmware through Recovery

When the automatic method does not work or you need to install a specific version of the software, you use a manual method through the Recovery menu. This requires you to download the appropriate firmware archive (usually with the extension.zip) from the official website or trusted sources. The file must be placed in the root of the internal memory of the device, not in the folder, so that the system can easily find it.

Then go to Recovery mode. This is done by turning off your smartphone and simultaneously clamping the power buttons and increasing the volume. In the menu that appears, select the language (if available) and click on the button "Install update.zip" or select the file through the menu "Select firmware file" in the MIUI interface.

• 📂 Download the correct firmware archive for your model (Global, EU, Russia).
• 💾 Place the file in the root directory of internal memory.
• 🔄 Reboot to Recovery Mode (Power) + Volume Up).
• ✅ Confirm the installation and wait for the process to be completed.

It's important to understand the difference between Recovery and Fastboot, and in this case, we're talking about Recovery, which allows you to upgrade your system without connecting to a PC using only the resources of your smartphone, a method that's less risky for beginners than firmware via Fastboot, because it has built-in compatibility checks.

Use of Mi Flash Tool and Fastboot Mode

For more advanced users or when the system is not booting, the firmware method is used through a computer with the Mi Flash Tool utility. This method requires an unlocked bootloader, which is an important condition. If the bootloader is locked, you will only be able to flash through official firmware, and then not all versions.

The process begins with the smartphone switching to Fastboot mode: when the device is turned off, press the power and volume buttons until an image of a rabbit repairing an android appears. Connect the USB cable to the computer and launch the Mi Flash Tool program, pre-installing the ADB and Fastboot drivers.

Choose the path to the unpacked firmware folder in the program and click the Flash button, a process that takes a few minutes, after which the device automatically restarts, a method often used to "save" phones after failed experiments or to change the region from China to Global.

⚠️ Note: When using the "Clean All" option + Lock, make sure you're flashing the original global firmware, and installing the closed-loader Chinese version on the global machine will result in a lock (brick).

Solving Common Errors During Updating

While updating the Xiaomi Mi 9T, there may be various errors such as “Can’t verify update”, “Zip file is empty” or endless reboot. Verification error often occurs when you try to roll back to an older version of Android or when you install firmware from another region without first unlocking the bootloader.

If you are faced with a message that verification is impossible, try downloading the full firmware version (about 3-4 GB), rather than the incremental (200-300 MB).The full versions contain all the necessary system files and less likely to cause conflicts when installed on top of customized assemblies.

In cases where the phone goes into a bootloop (reboot cycle), it may be necessary to log in to Recovery mode and perform a factory reset (Wipe Data) action that will delete all user data, but is often the only way to bring the device back to life after a failed update.

• 🚫 “Can’t verify update” error – try the full firmware version.
• 🔁 Bootloop – Recovery (Wipe Data) is required).
• 💿 Error: “Zip file is empty” – the file is damaged or not at the root.
• 🔓 The anti-mistake-rollback — You can't put the old version of the software.

Also worth mentioning is Anti-rollback protection, which prevents you from installing an older version of the bootloader or system than the one already installed, a security measure that prevents vulnerabilities from exploiting in older versions of the software and cannot be circumvented by standard methods.

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Using the full version of the firmware (Recovery ROM) instead of the incremental one significantly reduces the risk of verification errors and system conflicts.

Switching to new versions of Android and HyperOS

Xiaomi Mi 9T owners are often interested in the prospects of getting new versions of Android, including a transition to the HyperOS shell. Although official support for the model may be completed or limited, the development community continues to produce custom firmware based on the latest versions of Android 13 and 14.

The device officially came out with Android 9 and received updates to Android 11/12 depending on the region and version of MIUI. To install newer versions, you need to unlock the bootloader and install custom Recovery (for example, TWRP), which gives you full control over the file system.

Custom ROMs provide a modern interface and features not available on stock MIUI, but carry risks. The security of banking applications can be compromised if special modules (Magisk, Zygisk) that hide superuser rights are not configured.

If you’re not confident, you’d better stay on the latest official MIUI, which strikes a balance between performance and stability. Experiments with nightly builds should only be done on secondary devices or with a deep knowledge of Android modding.

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