Owners of the legendary Xiaomi Redmi Note 4X smartphone with a Snapdragon 625 processor often face the need to update software when official updates from the manufacturer have already stopped coming. Self-replacement of system software allows not only to return the device to performance, but also to install a more recent version of Android, gaining access to the latest security features. However, this process requires care and strict adherence to the algorithm of actions, since an error at any stage can lead to the failure of the gadget.
Before you start taking action, you need to be clear that flashing is an interference with the system partition of memory. Resetting all data is an inevitable step in the procedure, so creating a full backup of contacts, photos and important documents should be your first step. Ignoring this rule will lead to irretrievable loss of personal information, which will later be extremely difficult or impossible to recover.
In this article, we will discuss in detail the process of preparing, choosing the right system image and directly installing new software on your Redmi Note 4X. We will consider both standard methods through the recovery menu, and more advanced methods using a computer and the Mi Flash Tool. Proper preparation of the workplace and tools is the key to successfully completing the operation without critical errors.
Preparation of the device and choice of firmware
The first step in the upgrade process is to determine the exact modification to your device.Redmi Note 4X It came in different versions for different markets, and it's important not to confuse the global version with the Chinese version, because the firmware for them is not interchangeable. MCE16 or MCT7.
⚠️ Note: Install firmware from another model or region (e.g. Global on China) ROM without unlocking the bootloader) is guaranteed to turn the smartphone into a “brick".
Once the model is identified, you need to download the current system image. It is recommended to use official resources or proven forums where stable builds are laid out. The firmware file usually has the.zip extension to restore through the menu or archive to install via the PC. Make sure that the battery is at least 60% so that the device does not turn off at the most inopportune time.
A high-quality installation will also be required. USB-A cable, preferably original or certified, that can transmit data, not just charge the battery. Cheap cables often cause connection breakdowns, interrupting the recording process and damaging the boot sectors.
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Use it. USB-port located on the computer motherboard (back of the system unit), rather than the front panel or USB-hub to provide stable power and data transmission.
Required tools and drivers
To do the flashing, you'll need a computer running Windows. You'll need drivers on your PC that allow your computer to recognize your smartphone in different modes of operation. Without them, the firmware utility won't see the connected device.
There are two main types of drivers you may need: ADB/Fastboot drivers for bootloader and Qualcomm drivers (QDLoader) for EDL mode if deep recovery is required. Most often, for a standard Redmi Note 4X flash flashing, you just need to install the Qualcomm HS-USB QDLoader 9008 package and standard Android drivers.
☑️ Verification of PC readiness
Install drivers better to do in advance, before connecting the smartphone in special modes. If the system does not see the device, check the Device Manager: when connecting the phone in Fastboot or EDL mode, new equipment should appear there without exclamation signs. Sometimes you need to manually specify the path to the folder with drivers through the Device Manager.
Unlocking the bootloader (Bootloader)
The official firmware of the global version on the Chinese or custom build is impossible without unlocking the bootloader. This is a Xiaomi security mechanism that prevents the installation of unverified software. The unlocking process requires linking the Mi Account to the device and obtaining special permission from the company's servers.
To start, you need to turn on the developer mode by clicking on the build number several times in the About menu, then in the advanced settings, you activate the "OEM unlocking" and "Debugging over USB", and then you need to link the phone to your Mi Account by entering your account information in the corresponding menu.
How long will it take to unlock?
Once you submit your application through the Mi Unlock Tool utility, the PC will start counting down, during which time you can not log out of your Mi Account on your phone and reset your settings. Once the timer expires, reconnecting your phone in Fastboot mode and pressing the unlock button in the program will complete the process.
⚠️ Note: After unlocking the bootloader, the Find My Device function may not work properly, and some banking applications will stop working without additional manipulation of access rights.
Fastboot and Mi Flash Tool
The most reliable and clean way to install software is using Fastboot mode and the Mi Flash Tool program. This method allows you to completely clean old memory partitions and write the new system clean, which eliminates compatibility errors and “junk” from previous versions.
To switch to Fastboot mode on the Redmi Note 4X turned off, you need to press the power and volume buttons at the same time. The image of a rabbit repairing an android will appear on the screen and the inscription Fastboot. Connect your smartphone to your computer and launch the Mi Flash Tool utility on behalf of the administrator.
In the program, press the Refresh button to allow the system to detect the device. In the address field, specify the path to the folder with the unpacked firmware. It is important to select the correct firmware mode at the bottom of the window:
- 🧹 Clean all – complete data cleanup and installation of new firmware (recommended).
- 📁 Save user data – saving user data (may cause errors when changing region).
- 🧹📁 Clean all and lock – Clean, install and re-lock the bootloader (only for identical regions!).
After selecting the mode, press the Flash button and wait until the process is over. The progress bar in the program will show the status of execution. Under no circumstances, turn off the cable or interrupt the process until the indicator is green with the words "success".
Installation through Recovery Menu
If you already have a bootloader unlocked and a customized Recovery (such as TWRP) installed, or you are upgrading within the same version (Global on Global), you can use the built-in recovery menu, which is less versatile, but easier for those who are afraid to work with a computer.
The.zip firmware file must be placed in the root of the internal memory or on the memory card. Then enter Recovery mode: on the phone turned off, press the power and volume buttons. From the menu, select the language (if available) and the "Wipe Data" option, confirming the reset.
Then select "Install" or "Update," find the downloaded archive and confirm the installation. The system will check the integrity of the file and start the update. Once completed, click "Reboot System." This is good because it doesn't require a PC at hand, but it doesn't allow you to change the firmware region without additional complexity.
Common mistakes and ways to solve them
During the process of flashing the Xiaomi Redmi Note 4X, users often encounter various errors. One of the most common is the error "Flash Error" or "Missmatching image and device" in the Mi Flash Tool.
Another common problem is that you can bootloop after you install it. If the phone is rebooting indefinitely, try a full Wipe All Data reset via Recovery. If that doesn't work, you may have damaged the userdata partition and need to re-rout the Clean All mode.
| Error | Probable cause | Decision |
| :--- | :--- | :--- |
| Mi Flash Error 0x80004005 | Problems with drivers or path to file | Reinstall drivers, move firmware to the root of disk C: |
| Phone can't see PC | Faulty cable or port | Replace USB-cable, use another port USB 2.0 |
| Bootloop (reboot cycle) | Error in data or cache | Make Wipe Data/Factory Reset in Recovery |
| Signature verification error | bootloader lock | Unlock Bootloader via Mi Unlock Tool |
⚠️ Note: If the touch screen or camera stopped working after flashing, you probably installed firmware from another model (for example, from Redmi Note 4 MediaTek instead of Snapdragon.