The smartphone Redmi 9C, released in 2020, was initially supplied with the MIUI shell based on Android 10. However, many users are looking to get a more recent version of the operating system to improve security and access new application features. The process of switching to Android 11 can be done either through official OTA updates or manually using recovery tools.
It is important to understand that Xiaomi support for low-end models is periodically discontinued, so automatic updates may not be available in your region. In such cases, manual installation of the firmware is required, which carries certain risks. This article describes in detail all stages of preparation and installation in order to minimize the likelihood of device failure.
Before taking any action, you need to assess the current state of your gadget. If the device is under warranty, any manipulations with the bootloader or custom recovery may deprive you of the right to a free repair. Make sure you are ready to take responsibility for the possible consequences.
Preparing your device and backing up your data
The first and most critical step is to save all important information. The flashing process often involves completely deleting data from the internal drive. Use Google Drive or a local computer to create a complete copy of contacts, photos and documents.
You should also check the battery charge. The charge level should be at least 60%, and it is better to bring it to 100%. A sudden power outage while writing system partitions can lead to irreversible damage to the software.
⚠️ Attention: Before starting the procedure, be sure to back up all personal data to an external drive or cloud storage, as the internal drive will be completely wiped.
Remember to write down your credentials. After resetting the settings, the system will require you to enter the password from Mi Account or Google accountassociated with the device. If you forget this data, the phone may be blocked forever due to triggered FRP protection.
☑️ Ready for firmware
Official update method via OTA and Recovery
The most secure way to get Android 11 —this is the use of standard system tools. Check for updates in the settings menu. To do this, go to Settings → About phone → MIUI version.
If an update is available, the system will prompt you to download the package and install it. In some cases, the update may not arrive over the air due to regional restrictions. Then you can use the function of selecting a package manually.
In the upper right corner of the screen, click on the three dots and select Select the firmware file. You will need to first download the full firmware archive (Recovery ROM) for your specific model and place it in the root of the internal memory.
- 📂 Download the current firmware from the official website or a trusted resource.
- 📁 Move the file
.zipto the root directory of the internal storage. - 🔄 Start the installation through the update menu in the settings.
After starting the process, the phone will reboot and begin the installation. The screen may go dark for a few minutes - this is normal behavior. Do not try to interrupt the process or press buttons at this moment.
If the OTA update does not arrive, try changing the region in the settings (for example, to India or Global), check for the update, and then return your region.
Manual installation via Fastboot and ADB mode
For more advanced users, the installation method via mode Fastboot. This method requires a computer and an installed package of tools ADB i Fastboot. It allows you to bypass some limitations of OTA updates.
You must first unlock the bootloader, if required for the selected firmware type. Official unlocking is performed through the utility Mi Unlock Tool after waiting a period of 168 hours (7 days) from the moment the account is linked.
Connect the phone to the PC in Fastboot mode by holding down the Volume Down and Powerbuttons. Make sure your computer can see your device. In the command line, enter the command to check the connection:
fastboot devicesIf the device is displayed in the list, you can start flashing the firmware. To install a recovery image or full firmware, specific commands are used depending on the file type. Be extremely careful when entering commands, as an error may erase the partition persist, resulting in loss of IMEI.
⚠️ Warning: Incorrect use of Fastboot commands may result in loss of network identification numbers (IMEI). Make sure that you are using firmware that strictly matches the region of your device.
The process of writing data to flash memory can take from 5 to 15 minutes. When finished, the phone will automatically reboot. The first startup after manual firmware usually lasts longer than usual.
What to do if the computer does not see the phone in Fastboot?
Install universal ADB Interface drivers through Windows Device Manager. Often the system automatically installs the wrong driver, which needs to be updated manually by selecting the device from the Android Phone -> Android Bootloader Interface list.
Using TWRP custom recovery
Installing a custom recovery, such as TWRP, provides access to advanced system management functions. However, Redmi 9C this requires special care due to the specifics of the processor. MediaTek Helio G35.
Before installing TWRP, you must unlock the bootloader. Without this step, burning a third-party recovery image is not possible. After unlocking, download the image twrp.imgthat is compatible specifically with your version of the device.
The image is flashed via Fastboot with the command:
fastboot flash recovery twrp.imgImmediately after executing the command, you need to boot into recovery mode by holding Volume Up and Power. If this is not done, the standard recovery may overwrite TWRP on the first boot.
| Parameter | Stock Recovery | TWRP Recovery |
|---|---|---|
| Interface | Text menu | Touch graphic |
| Installation ZIP | Only signed MIUI | Any compatible ZIP |
| Backup | Not available | Full backup of partitions |
| Data clearing | Factory Reset | Selective clearing (Dalvik, Cache) |
In the TWRP environment, you can install custom firmware on database Android 11if the official one from Xiaomi is no longer supported. Before installation, be sure to make a full backup (Nandroid Backup) through the Backup menu.
Solving common errors and problems with firmware
During the update process, users often encounter an error Can't verify update or Error 7. This means that the firmware signature does not match the current version of the bootloader or the firmware region is different from the device region.
To solve the problem, try clearing the application data Updater (Update) in the application menu or use the installation method via TWRP, which ignores signature verification. Also make sure that you are not trying to roll back to an older version of Android without special preparation.
If the phone is stuck at the logo Redmi or MI (Bootloop), try entering Recovery mode and performing a factory reset (Wipe Data). In extreme cases, flashing via EDL mode will be required using an authorized Mi account.
- 🚫 Signature verification error: region mismatch or blocked bootloader.
- 🔄 Bootloop: system file conflict, resolved by a complete wipe.
- 🔋 Fast discharge after the update: rebuilding the Dalvik cache in the first hours of operation.
Sometimes after the update the network signal may disappear or the fingerprint may stop working. This indicates that the partition is damaged. persist. Restoring this partition is only possible from a backup copy or by a service center.
Most errors during firmware occur due to a mismatch between the region of the firmware and the device or an attempt to update with a locked bootloader.
Optimizing the system after installing Android 11
After successful installation Android 11 the system needs time to adapt. The first few hours the phone may be unstable, heat up and quickly consume battery. This is due to background optimization of applications and file indexing.
It is recommended to remove unused system applications that may have remained from the previous firmware version. Use the built-in cleaner or third-party tools to remove bLOATware, but be careful with system components.
⚠️ Attention: The interface and location of settings in MIUI may vary slightly depending on the version of the shell. Always check the official support materials for your specific model.
Check your battery and app permission settings. In Android 11 the rules for access to files and location have been tightened. Make sure that apps that are important to you have the necessary rights to work correctly.
To improve performance, you can enable extended memory (Virtual RAM), if this feature is available in your version of MIUI. It is also worth disabling animations in the menu For developersby setting the window scale to 0.5x.
After a major system update, let the phone charge for about 1-2 hours with the screen off. This will allow the system to complete all background optimization processes.
Is it possible to update Redmi 9C to Android 12 or 13?
Officially Xiaomi stopped support Redmi 9C on version Android 11 (MIUI 12.5). Updates to Android 12 and higher are only possible through the installation of custom firmware (Custom ROM), which requires unlocking the bootloader and carries the risk of losing the warranty.
Will installing the firmware erase all my data?
When updating via OTA (over the air), the data is usually saved. However, during manual installation via Recovery or Fastboot, especially when changing the region or version of Android, it is recommended to perform a complete data wipe (Wipe Data), which will delete all files.
What is FRP lock and how does it affect the firmware?
FRP (Factory Reset Protection) is Google protection that requires you to enter your account after resetting the settings. It does not affect the flashing process itself, but if you forget your Google account password after the reset, it will be extremely difficult to unlock the phone.
Is it safe to unlock the bootloader on Redmi 9C?
Unlocking the bootloader is officially allowed by Xiaomi, but it erases all data from the device and makes it more vulnerable to malware. This will also void the warranty and may interfere with the operation of some banking applications and Widevine L1 (streaming quality).
Why did the phone become slower after the update?
In the first days after the update, the system indexes and optimizes the cache. If the problem persists for a long time, try clearing the partition cache or performing a factory reset after saving the data.