How to install firmware on Xiaomi Redmi Note 4: A guide for pros

Owners of the legendary Xiaomi Redmi Note 4 (codenamed nickel or midone) often face the need to reinstall the operating system, which can be caused by software failures, “bricking” the device after a failed experiment, or simply wanting to change the firmware region from Chinese to global.

Before you start taking action, you need to clearly identify the model of your device. There are two main versions of this smartphone in the world: one based on the Qualcomm Snapdragon processor and another on MediaTek. One version of the firmware is categorically not suitable for another, and trying to establish an incompatible image can lead to complete failure of the gadget. The exact model is indicated on the box or in the settings menu if the phone is still turned on.

In this article, we will discuss in detail all the preparation steps, installation methods through Recovery and Fastboot, as well as the nuances of unlocking the bootloader. You will learn how to avoid typical errors and what tools will be required for successful flashing. Following the instructions will help return your device to a second life or update Android to the current version.

Model identification and tool preparation

The first and most critical step is to determine the exact modification of your smartphone. As mentioned, the Redmi Note 4 came in versions with Snapdragon 625 and MediaTek Helio X20 chips. The Snapdragon version is characterized by a processor codenamed nickel, and MediaTek is called midone. If you confuse this data, you run the risk of getting a non-functional device that will require a programmer to restore.

You can check the model in a number of ways. If the phone turns on, go to Settings. → About the phone and find the line "Version" MIUI». It will be written at the end of the version, for example, 8.0.3.0.MBFMIDO (here MIDO You can also use third-party tools like this. CPU-Z or AIDA64, Which will tell you exactly what chip is installed.

For the operation you will need a high-quality USB-cables, preferably original or certified, no longer than 1 meter long, and long and cheap cables often do not provide stable connections, leading to data transmission errors. A Windows computer is also needed, as most official Xiaomi tools don’t run on macOS or Linux without complex emulations.

⚠️ Warning: Before any manipulations, make sure to make a full backup of all important data. The firmware process involves formatting internal memory, which will lead to irretrievable loss of photos, contacts and applications.

Make sure your smartphone battery is at least 60 percent power-consuming, and suddenly turning off the device at a critical moment can damage the bootloader's partitions. If the phone doesn't turn on, try charging it off for at least 30 minutes before connecting to your PC.

Unlocking the bootloader (Bootloader)

The official installation of global firmware on the Chinese version or the transition from MIUI to custom builds (LineageOS, Pixel Experience) is impossible without an unlocked bootloader. Bootloader is a program that runs to the operating system and checks the digital signature of the downloaded software.

The unlocking procedure requires you to link your Mi Account to your device and obtain special permission from Xiaomi. After submitting an application through the Mi Unlock Status app (available in the About Phone menu → click on the MIUI version several times), you will have to wait from 7 to 15 days, a mandatory restriction that cannot be circumvented by legal methods.

After the waiting period, it is necessary to:

• 🔓 Download the official Mi Unlock Tool utility to your computer.
• 🔓 Log in to the same Mi Account that was tied to your smartphone.
• 🔓 Transfer the phone to Fastboot mode (click the volume button and connect the cable to the PC).
• 🔓 Press the Unlock button in the program and wait for the process to be completed.

Once successfully unlocked, the phone will be completely cleared and the screen will display an open lock icon when booted, which is normal for an unlocked device. It is important to know that unlocking the bootloader automatically resets the manufacturer's warranty at most service centers. In addition, some banking applications may stop working due to a security breach (SafetyNet), although this is often resolved by Magisk installation.

Method 1: Install firmware via Recovery (without PC)

The easiest and safest method to upgrade or reinstall the system is to use the built-in Recovery mode, which is suitable if the phone is turned on and able to boot into the recovery menu. It does not require an unlocked bootloader if you install the official firmware of the same branch (for example, Global on Global).

First, you need to download the.zip (Recovery ROM) firmware archive from the official website miui.com, and put it in the root of the smartphone’s internal memory. Importantly, if you’re changing regions (e.g., from China to Global), this method may not work without first unlocking and completely clearing the data.

The following is the procedure through Recovery:

1. Go to the Settings menu → About the phone → System update.
2. Click on three dots in the corner of the screen and select “Select firmware file”.
3. Please indicate the path to the downloaded.zip archive.
4. Confirm the installation and wait for the reboot.

If the phone doesn't boot, you can log in to Recovery manually. To do this, press the Volume Up + Power buttons at the same time until the logo appears. From the menu, select the language (usually available in English and Chinese), then the Wipe Data option (data cleanup), and then Connect with MIAssistant, or simply select the archive through the file manager if the mode allows. However, the classic Recovery MIUI often doesn't see the firmware files without using MIAssistant mode and a PC connection, or requires a file signature.

💡

If the built-in updater doesn't see the firmware file, rename the archive to update.zip and put it in the root of internal memory, not in the folder. Sometimes cleaning the Update app cache through the application settings helps.

Method 2: Fastboot and MiFlash (Professional Method)

The Fastboot method is the most powerful tool in Xiaomi’s arsenal, allowing users to reflash their phones even in the event of a major software failure when Recovery is not available. ROM) Xiaomi MiFlash Tool and MiFlash Tool.

The main advantage of this method is the ability to completely clean all partitions (Clean All), which ensures that there is no conflict between the old and the new system. However, to install global firmware on a Chinese device or change the region through Fastboot, you need an unlocked bootloader. If the bootloader is closed, the program will give an authentication failed error.

Instructions for firmware through MiFlash:

• 💻 Unpack the firmware archive.tgz in the root of the C disk (the path should not contain Cyrillic or spaces).
• 💻 Run MiFlash.exe on behalf of the administrator.
• 💻 Transfer the phone to Fastboot mode (Loudness button down) + Power) and connect to the PC.
• 💻 In the program, click Refresh, select the device and specify the path to the folder with the firmware.
• 💻 Downstairs, select mode. clean_all And press "Flash».

During the firmware process, the indicator in MiFlash will change color: yellow is the record, green is the success, red is the error. 5-10 minutes, maybe the problem is USB-In such cases, try another port. USB 2.0 (through USB 3.0 There are conflicts with old devices or reinstall drivers Qualcomm/ADB.

Possible errors and methods of their elimination

Even with strict adherence to the instructions, there can be unexpected situations. One of the most common problems is the error "Can't verify update" when trying to install firmware through Recovery. This means that the signature of the file does not match the current region of the device, the solution is one: unlock the bootloader and do "Clean All" through Fastboot, or look for a special version of the firmware bridge (bridge ROM).

Another common problem is the “brick” when the phone hangs on the logo after the firmware is installed. MI Or it goes into an endless reboot. 90% In some cases, it is treated by re-running through Fastboot with a choice of mode. clean_all. If the phone is not detected by the computer in Fastboot mode (the display is black, but there is vibration), the section may have crashed. PBL Or the bootloader is damaged, and then only the mode will help. EDL (Emergency Download Mode, which requires an authorized Mi Account for firmware (Mi Auth), which is available mainly to service centers.

⚠️ Warning: Do not interrupt the file recording process, even if it seems that the phone is frozen. Interrupting at the final stage can destroy the partition table, and recovering the phone without disassembling and closing contacts on the board will be extremely difficult.

If the camera, flashlight or fingerprint sensor is not working after the firmware, the persist and modem partitions are likely to be lost or damaged. These partitions contain calibration data of a particular device, and you can only recover them if you have a backup from your device (made before the problems) or by a complex procedure for transferring data from a similar donor, which is only possible for experienced engineers.

Frequently Asked Questions (FAQ)

💡

The most reliable way to bring the Xiaomi Redmi Note 4 back to life is to use the Fastboot mode and the official MiFlash utility with complete data cleanup.