Changing the operating system to Xiaomi Redmi 9C NFC is not just a technical procedure, but an opportunity to fully unleash the potential of your budget smartphone. Many users face the limitations of the Chinese version of the software or want to upgrade to a fresher build, which the manufacturer has stopped releasing officially, it is in these situations that custom firmware or manual installation of the global version come to the rescue.
The process of replacing firmware requires carefulness and a clear algorithm of actions. A mistake at any stage can lead to data loss or, in the worst case, turn the device into a brick. However, if you prepare all the necessary tools and files in advance, the risk is minimized, and the result will please the speed and stability of the work.
In this article, we will discuss in detail how to safely change the firmware, what tools will be required to work with Redmi. 9C What nuances should be paid special attention to the owners of the model with a module NFC. Get ready to work with Fastboot and ADB, because they're not the only ones.
Preparation of the device and necessary tools
Before you start any manipulation of the system partition, you need to make sure that the smartphone is fully ready for the procedure. The first thing you need to do is to create a full backup of all important data, because during the change of firmware, the internal memory will be completely cleared.
You will need quality. USB-The cable, preferably the original one, that came with the kit, and the computer running Windows. Also make sure the battery charge of the smartphone is at least 60% so that the device does not turn off at the most inopportune moment. 9C NFC It is critical to install drivers ADB and Fastboot.
⚠️ Warning: Using an unoriginal or damaged cable during firmware may cause connection breakage and irreversible damage to the loader.
Download the current firmware version that matches your model. 9C NFC model-name miui_CMI or miui_CMInfc. Do not confuse files intended for a version without NFC, Otherwise, the contactless payment module may cease to function.
☑️ Firmware readiness
Unlocking the Bootloader bootloader
The key step to changing the firmware type (e.g. from Chinese to global) is unlocking the bootloader. Without this step, the Mi Flash installer will simply refuse to write new data, giving a signature verification error. The unlocking process requires having a Mi Account and linking the device to it.
Go to the smartphone settings, go to About Phone and click on the build number several times to activate the developer menu. Then, in the advanced settings, look for Mi Unlock Status and link your account. After that, wait 168 hours (7 days) before the service allows you to unlock.
After the waiting period, connect the phone to the PC in Fastboot mode (clamping the volume button when the device is turned off) and launch the Mi Unlock Tool utility. The program will check the account status and, if all conditions are met, unlock the device, having previously cleared all data.
What to do if the timer is not going?
Selection of firmware type: Global, China or Custom
Understanding the differences between software versions will help you make the right choice: the official Global ROM contains all the necessary languages, including Russian, and pre-installed Google services optimized for the international market. The Chinese version (China ROM) often gets updates faster, but may not have the right languages and contains a lot of local software.
Custom firmware like LineageOS or Pixel Experience allows you to get a clean Android without shell MIUI. This is a great option for Redmi. 9C NFC, If you're not performing well, because these systems consume less resources, they may have bugs in the camera, or they may have bugs in the camera. NFC-module.
When selecting a file, look for an extension. Fastboot requires an archive with the.tgz extension, and.zip for an update via Recovery. Installing the wrong format through the wrong tool is the most common mistake of beginners.
Installation of firmware through Fastboot
Fastboot is the most reliable method of installing the system cleanly, avoiding conflicts of old files. For this you will need Mi Flash Tool. Rasp download the archive with firmware to the root of the C disk so that the path to the folder does not contain Cyrillic characters or spaces.
Put your smartphone into Fastboot mode by pressing the volume button when you connect to your computer. In Windows Device Manager, the device should be identified as Android Bootloader Interface. Launch the Mi Flash Tool, press the Refresh button and select the path to the unpacked firmware folder.
flash_all.batIn the lower right corner of the program, select Clean all mode to completely erase data and avoid errors. Press Flash and wait for the process to complete, which can take 300 to 600 seconds. Once installed successfully, the phone will automatically restart.
⚠️ Warning: If the progress bar freezes during the firmware process or there is a red error, do not turn off the cable immediately. USB-port (preferably) USB 2.0) and press “Refresh».
The first run after a firmware change can last up to 10 minutes. Don't panic if you see the Xiaomi or Android logo on a black screen - the system adjusts the components.
Firmware through Recovery Mode
An alternative way to upgrade or change the version is to use a built-in backup, which is suitable if you already have a bootloader unlocked but you can't use a PC, and you'll need a firmware file in.zip format, which you'll need to rename to update.zip and put in the root of internal memory.
To enter Recovery mode, press the volume button when the phone is turned off. From the menu, select a language (if available) and go to the installation point. If the standard menu does not see the file, you may need a third-party backup, such as TWRP.
From the TWRP menu, select Install, find the firmware file, and confirm the swipe action. Once you have completed the installation, be sure to run Wipe Data to avoid cyclical bootloop.
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Before you run through Recovery, make a full backup of the EFS and Persist partition via TWRP. This will save your IMEIs and sensor calibrations, which are difficult to recover in the event of a failure.
Common mistakes and ways to solve them
When you replace software, you often encounter an Anti-rollback error, which is a security mechanism that prevents you from installing an older version of your firmware than you currently have, and if you try to roll back on the older version, the device can lock up forever.
Another common problem is the lack of drivers in the system. If your computer can't see your phone in Fastboot mode, install Google USB Driver universal drivers or use the DriverInstaller program from Mi Unlock, which also helps to switch USB ports.
The table below will help you quickly diagnose the problem by the error code or symptom:
| Symptom/Error | Probable cause | Decision |
|---|---|---|
| Error 1: Connection failed | Bad cable or port | Replace the cable, use the USB 2.0 port on the back of the PC |
| Error 5: Flash error | Wrong type of firmware | Check if the Anti-Rollback version is blocked |
| The phone hangs on the logo. | Data conflict | Do Wipe All Data with Recovery |
| NFC's not working | The wrong regional version | Strictly flash the NFC model (CMInfc) |
If the device went into a bootloop after a failed attempt, try logging into the Fastboot and flashing again with the Clean all option. EDL-This is often done with an authorized Xiaomi account.
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The main rule of successful firmware is to always check the compatibility of the region and the bootloader version before starting the process.
Setting up NFC after flashing
After installing the new system, the NFC module may require additional customization, especially if you have switched from the Chinese version to the global one. Make sure the correct payment element is selected in the Security app or in the NFC settings. For the Redmi 9C, NFC is usually HCE Wallet.
If you use custom firmware, check for NFC configuration files. Sometimes you need to manually prescribe the path to the payment application in contactless payment settings, and it is also worth checking the work of Google Pay (or its analogues) by adding the card again.
In some cases, network resets help. Go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. This will not affect your personal files, but update network configurations, which often solves NFC problems.