How to Reflash Xiaomi Redmi 4X: The Complete Guide

Xiaomi Redmi 4X, despite its age, remains a popular device due to its reliability and the ability to install custom firmware. However, over time, the standard operating system MIUI may cease to receive security updates or new features, which encourages users to look for ways to upgrade.

Before you start any manipulation of system files, you need to be aware of the risks associated with interference with the bootloader. Wrong actions can lead to the loss of warranty, although for this model it has long expired, or, in the worst case, turn the phone into a “brick.” This article describes in detail the safe algorithms of actions that will help you avoid fatal errors when working with partitions of memory of the device.

There are several ways to restore or update software, from standard updates through the settings menu to advanced flashing through the computer. The choice of the specific method depends on the current state of your gadget and the end goals, whether it is a return to factory settings or installing an alternative Android operating system. We will look at the most effective and time-tested techniques relevant to the Snapdragon 435 architecture.

Preparation of the device and assembly of necessary tools

Success of the operation 90% It depends on the quality of the workplace and the availability of all the necessary components, you will need the Redmi smartphone itself. 4X, fit USB-cable (preferably original or certified, thick wires) and a Windows computer. It is also critical to ensure a stable Internet connection to download files and charge the device battery to a minimum of 60-70%, to avoid sudden shutdown during the recording process.

The first step is to download specialized software on a PC. The main tool for working with Xiaomi devices in Fastboot mode is the Mi Flash Tool. ADB/Fastboot, which ensure the correct interaction of the computer operating system with the hardware of the phone.

Remember to make a full backup of all important data, as the flashing process in most cases involves full formatting of internal memory. Contacts, photos, documents and application settings will be permanently deleted if you do not save them in advance to the Mi Cloud cloud server or to your computer.

Unlocking the Bootloader bootloader

The key step without which you can not install a global version of firmware on a Chinese or custom build is to unlock Bootloader. By default, the bootloader is blocked by the manufacturer for security reasons, which prevents unauthorized change of the system partition. To perform this procedure, you will need a Mi Account, which must be tied to the device for at least 72 hours (sometimes the wait period can reach 7 days).

The process begins with submitting an application on the official Xiaomi website through a special utility Mi Unlock Status. After linking the account, you need to go to the developer menu, activate the Factory Unlock item and enter account data. Only after that the phone will be ready to interact with the unlock program on the computer.

⚠️ Attention: The bootloader unlock process automatically erases all data on the device and resets security settings. Make sure you save all important files before running the Mi Unlock utility.

Once successfully unlocked, the device status will be marked, and when the phone is turned on, the screen will display an open lock icon or the words FASTBOOT. This is a normal phenomenon, indicating that the bootloader mode is now open to external interventions, from which point you get full control over the memory sections of the smartphone.

Finding and Choosing the Right Firmware

Choosing the right software version is a critical point, as installing an incompatible file can cause communication modules or touchscreen to fail. For the Redmi 4X (codenamed santoni), there are different types of firmware: Global Stable, Global Beta, China Stable, and custom builds based on LineageOS or Pixel Experience.

It is important to distinguish between firmware types by installation method. There are Recovery versions (extension.zip) that are installed through the recovery menu, and Fastboot versions (extension.tgz) that require connection to a PC. For a clean installation with the complete removal of old data, it is recommended to use the Fastboot version, which contains the full system image.

You should only download files from trusted sources, such as the official website miui.com or authoritative forums like XDA Developers. Using files from questionable file sharing sites can lead to malware infection or the installation of modified software with hidden tracking functions.

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Pay attention to the firmware region. Installing the Chinese version (CN) on the global device (Global) can cause problems with LTE frequencies and the lack of Russian in the menu.

The process of flashing through Fastboot

Fastboot is considered the most reliable method and allows you to restore the device even in the event of serious software failures. First, you need to unload the downloaded archive with firmware (usually a file.tgz) to the root of the C disk so that the path to the folder is short and does not contain Cyrillic characters. Extract the contents of the archive until you see files with extensions.bat and images folders.

Put your smartphone in Fastboot mode, holding the power and volume buttons on the device that is turned off at the same time. Connect your phone to your computer with a cable. Launch the file. flash_all.bat (for complete cleaning; or flash_all_except_data_storage.bat (to save data if versions are compatible) on behalf of the administrator.

In the command line window, you will see the progress bar and text description of current actions, for example, erase persist, flash system, flash boot. The entire process takes 300 to 600 seconds depending on the speed. USB-port and firmware.

⚠️ Note: If the “Anti-rollback check failed” error is in the muncul firmware process, it means that you are trying to roll back to an older version of Android, which is prohibited by Xiaomi’s security policy.

Once the procedure is complete, the phone will automatically restart. The first boot can take up to 5-10 minutes as the system optimizes applications and creates new configuration files. Don't panic if the screen stays black for a long time or the Mi logo hangs for a long time - this is the standard behavior for the first run after Wipe.

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Using Fastboot mode guarantees a clean installation of the system without conflicts of old files, which is the best solution when switching between regions (China <-> Global).

Alternative methods and recovery mode

If you can't use your computer, you can use the built-in Recovery mode, which is suitable for upgrading within a single region or installing official systems. OTA-To enter this mode, you need to press the power and volume buttons. The menu is controlled by the volume buttons (up/down) and the power button (select).

To install firmware through Recovery, place the.zip file on the device’s internal memory or SD-In the menu, select Wipe Data for cleaning, then go to Connect with MIAssistant (to transfer a file from PC to PC). ADB) or use the standard Install item if the file is already in memory.

• 📱 Official Recovery: Allows you to install only signed Xiaomi firmware, blocks the installation of custom cores.
• 🔧 TWRP (Team Win Recovery Project: Third-party recovery that gives full access to the file system, allows you to make full backups (Nandroid) and install any ZIP-archive.
• 🔄 OTA Update: The easiest way to work is through the System Update menu, but requires a working current firmware.

Installing a custom recavator like TWRP requires an already unlocked bootloader and is performed via Fastboot by the fastboot flash recovery command twrp.img. This opens the door to installing full custom firmware that can significantly extend the life of the device by providing more recent versions of Android than official support.

Solving problems and errors in firmware

When you flash through the firmware, you often encounter a variety of bugs that can stop you from doing it. One of the most common problems is hanging on the Mi logo (bootloop). If this happens after a successful firmware, try resetting your data completely through Recovery (Wipe Data/Factory Reset).

Another common problem is lack of communication or non-functioning IMEI. This can happen if the persist or modem partition is damaged. In such cases, it helps to firmware the corresponding version of the stock modem or restore a backup copy of the partition. EFS, If it was done in advance, it's also worth checking if the settings are wrong. APN.

If your computer stops seeing your phone in Fastboot mode, try the following:

• 💻 Replace USB-cable for quality and short.
• 🔌 Switch the device to another USB-port, preferably USB 2.0.
• 🛠 Reinstall Qualcomm drivers HS-USB QDLoader 9008 in Device Manager.
• 🔋 Check the battery power, as at low charge, the Fastboot mode may not be activated.

⚠️ Note: If the phone is gone EDL (a burning charging indicator, black screen, is defined as QDLoader 9008 in Device Manager, and an authorized Mi Authorized Account may be required for firmware, as conventional methods may be blocked.

In the event of critical errors that cannot be solved software, it may be necessary to open the case and close the test points on the board to force entry into EDL mode. This is an extreme measure that requires special skills and tools, and it should be resorted to only if other methods have not helped.

Frequently Asked Questions (FAQ)