Updating the operating system on a smartphone Xiaomi Redmi 9 to Android 11 often becomes a necessity when official support for the device is discontinued or the current version is no longer available MIUI is unstable. Many users are faced with the fact that automatic notifications about new firmware never arrive, although the global version is already available for download. Manual installation allows you not only to get the latest security features and a new interface, but also to fix many software bugs that have accumulated during the operation of the gadget.
The flashing process requires care and strict adherence to the sequence of actions, since any deviations can lead to data loss or turning the smartphone into a “brick.” In this article we will look at two main methods: a safe update through recovery mode and an advanced method through Fastboot with a complete memory clear. Before starting the procedure, make sure that the battery level is at least 60%, and all important photos and contacts are saved in cloud storage or on your computer.
It is worth noting that the transition to a new major version of Android on devices Xiaomi often involves changing the structure of memory partitions. This means that a simple system restart will not work—a full repartition or formatting of the data is required. If you have never modified the software of your smartphone before, carefully study each step of the instructions to avoid fatal errors at critical moments of the process.
Preparing the device and backing up data
The first and most critical step is to save all important information. When installed Android 11 on Redmi 9 the internal memory will be completely cleared, including photos, music, documents and application cache. Even if you plan to use a method without data loss, there is always a risk of failure, so creating a full backup is not a recommendation, but a mandatory requirement.
You can use built-in tools MIUI or third-party tools for backup. The most reliable way is to connect your smartphone to your computer and manually copy the folders DCIM, Download and Documents. Also, do not forget to export contacts to .vcf format and save them on external media, since synchronization with a Google account can sometimes fail when restoring after a clean installation.
⚠️ Attention: If you have a banking application or payment system installed on your device, be sure to unlink the device or remember your logins and passwords. After resetting the settings, access to some protected services may be temporarily blocked due to a change in the device identifier.
In addition to the data, it is necessary to prepare the hardware itself. You will need a high-quality USB cable, preferably original or certified, that guarantees stable data transfer, and not just charging. Poor contact in the connector USB Type-C during the firmware can interrupt the process of writing system files, which will lead to serious consequences for the bootloader.
☑️ Checklist for preparing for firmware
Unlocking the bootloader and setting debugging
Official installation of the global firmware from Android 11 to the regional version Redmi 9 or rollback from the beta version requires an unlocked bootloader (Bootloader). By default, the company Xiaomi blocks this feature to protect users from accidental damage, so the procedure must be initiated through a special service.
First, activate developer mode. Go to Settings → About phone and quickly click 7 times on the item MIUI versionuntil the notification “You have become a developer” appears. Then go to the menu Advanced → For developers and turn on the toggle switch USB debugging. This will allow the computer to interact with the phone at a low level.
Next you will need link your account Mi Account to the device. In the same developer menu, find the item Mi Unlock status and click "Add account and device". The main test awaits you here: security policies Xiaomi often require you to wait from 7 to 168 hours (from a week to a month) before allowing unlocking. This timer is tied to the server and cannot be bypassed programmatically.
If the unlock timer shows more than 168 hours, try logging out of the Mi account on your phone, rebooting the device and logging in again, then repeat the binding procedure in the Mi Unlock menu. Sometimes this resets an incorrect count.
After the waiting period has expired, download the utility Mi Unlock Tool on your PC, run it and log in with the same account. Switch the phone to Fastbootmode by holding down the Volume Down and Powerbuttons, connect the cable and press the "Unlock" button in the app. The process will take a few minutes and will completely delete all data from the device.
Selecting the firmware type: Recovery or Fastboot
Users are often confused by the variety of firmware files available on official resources and forums. For Redmi 9 there are two main formats of update packages, and choosing the right option directly affects the installation method and the final result. Selecting the wrong file type may result in a compatibility check error or a cyclic reboot.
Firmware type Recovery has an extension .zip and is intended for installation through the recovery menu or using the system itself. It is usually used for over-the-air updates or manual installations without completely wiping the data (although wiping is recommended when changing regions). This option is less risky, but has limitations when changing Android versions.
In contrast, the firmware Fastboot is delivered in the form of an archive .tgzthat must be unpacked on your computer. This image type contains all system partitions, including the bootloader,_recovery_, and system libraries. Installation via Fastboot is the most reliable way to migrate to Android 11as it guarantees a clean installation without conflicts with old configuration files.
| Characteristic | Recovery ROM (.zip) | Fastboot ROM (.tgz) |
|---|---|---|
| Installation method | Via Recovery menu or menu updates | Via PC and Mi Flash utility |
| Data clearing | Optional (depending on the type of update) | Required (full reset) |
| Speed process | Slower (10-20 minutes) | Faster (5-10 minutes) |
| Risk of errors | Medium (file conflicts are possible) | Minimal (full overwriting) |
| Requirements | Only file on phone | PC, drivers, unlocked BL |
Installation via the Recovery menu (Method without a PC)
If you are unable to use a computer or want to perform the simplest possible update, this method Recovery will be the best choice. However, to switch to a new version of Android, this method does not always work predictably, especially if you change the firmware region (for example, from Chinese to Global).
Download the firmware file Android 11 with the extension .zip for your model (Redmi 9, code name lancelot). Place the file in the root of the smartphone's internal memory, without putting it in folders, so that the system can easily find it. There is no need to rename the file, but make sure that the name does not contain Cyrillic characters.
Reboot the device into recovery mode. To do this, press the buttons Volume Up and Power at the same time and hold them until the logo Miappears. In the menu that appears, select a language (usually English and Chinese are available), then click Wipe Data. This is a mandatory step for the new system to work correctly.
⚠️ Attention: The itemWipe Datairrevocably deletes all files. Make sure you make a backup before confirming the action. After cleaning, selectInstall, find the downloaded zip file and confirm the installation.
After the process is completed, the smartphone will automatically reboot. The first boot after installation Android 11 may take up to 10-15 minutes as the system optimizes applications and creates new caches. Do not try to interrupt this process by pressing buttons, even if the screen remains black for a long time or shows the logo.
What to do if the "Can't verify update" error appears?
This error means that you are trying to install firmware from another region on a locked bootloader. Solution: unlock Bootloader via Mi Unlock or find firmware strictly for your current region (for example, RU to RU).
Firmware via Fastboot and Mi Flash Tool
The flashing method via Fastboot is the "gold standard" for specialists and experienced users who want to get a clean system no trash. To implement this method, you will need a PC with Windows OS, installed drivers Qualcomm or Xiaomi USB Driver, as well as the utility Mi Flash Tool.
Unpack the downloaded firmware archive .tgz to the root of drive C so that the path to the folder is short and does not contain spaces or Russian letters (for example C:\rom\lancelot_global_images...). Run Mi Flash as administrator and click the Refreshbutton. If the drivers are installed correctly, your device with a unique code will appear in the list.
At the bottom of the utility window, select the firmware mode. To switch to Android 11 it is critical to select the item clean all (clear all) to avoid file system conflicts. Mode save user data When changing the Android version, it often leads to loading errors or unstable operation of the sensor and network.
fastboot devicesfastboot flash boot boot.img
fastboot flash system system.img
Press the button Flash and wait for the process to complete. A progress bar will show the status of the operation, and at the end you will see a "Success" message in green. After this, the phone will reboot on its own. If the device is frozen at the logo, try holding the power button for 10 seconds to force a reboot.
Using the "clean all" mode in Mi Flash Tool is mandatory when changing the Android version, since old user data is incompatible with the new structure of Android 11 system partitions.
Possible errors and ways to resolve them
Even if you strictly follow the instructions, unforeseen situations may arise. One of the most common problems is an error Miss-matched image and device in the utility Mi Flash. This means that you downloaded the firmware for a different model (for example, for Redmi 9C instead of Redmi 9) or for a different type of processor. Always check the device code name (lancelot) before downloading.
Another common problem is getting stuck on the logo Mi or Android after installation. This is often due to the fact that the partition userdata was not formatted correctly. In this case, you need to enter the mode again Recovery, select Wipe Data → Wipe All Data and reboot the system. This will remove the remnants of old settings that interfere with startup.
If the computer does not see the phone in Fastbootmode, the problem lies in the drivers or USB port. Try connecting the cable to a different port (preferably USB 2.0, not 3.0), reinstalling the drivers through Device Manager, or using a different cable. Sometimes disabling driver digital signature verification in Windows helps.
⚠️ Attention: Firmware and interface versions can be updated by developers. If the link to the official file does not work or the Mi Flash utility displays a server error, check the latest software version on the official community forum or in the Mi Community application.
Before flashing the firmware, disable the antivirus and Windows firewall. They can block the work of Mi Flash Tool scripts, which will lead to an error in writing the image to the device.
Frequently asked questions (FAQ)
Will I lose the warranty after manually installing Android 11?
Unlocking the bootloader and manual flashing will officially void the software warranty in most service centers Xiaomi. However, if you can lock the bootloader back (which is only possible on the original firmware), there will be no visual traces of interference, but the status in the database may be preserved.
Is it possible to switch from Chinese firmware to Global with Android 11?
Yes, this is possible, but only with an unlocked bootloader. Direct upgrade from CN to Global without unlocking BL will brick the device. After unlocking, use the method Fastboot with mode clean all to safely change the region.
What to do if NFC or banking applications do not work after the firmware?
On some custom or modified assemblies, security certificates may be lost. Try clearing the application data Google Pay and re-authorizing. If the problem persists, you may need to reflash the image persist.img, but this is a complex procedure that requires a dump from a working device.
How long does the entire installation process take?
Writing the files through Fastboot takes about 300-600 seconds. However, taking into account the preparation, unlocking the bootloader (which may require waiting 7 days) and the first boot of the system, allocate at least 1-2 hours of pure time for the procedure if the bootloader is already unlocked.
Is it possible to return to Android 10 if I don’t like version 11?
Yes, a rollback is possible. You will need to find the firmware archive with Android 10 for your model and install it in the same way (via Fastboot or Recovery). Remember that when rolling back the Android version, you will also need to completely format the data.