The process of updating or restoring the operating system on the Xiaomi Redmi Note 4 smartphone can seem difficult only at first glance. Owners of this popular device often face the need to flash the firmware due to the appearance of software errors, the need to change the region or the desire to install a custom version of Android. Properly executed procedure allows you to bring the gadget back to life even in case of serious failures that are not solved by a conventional reset.
Before you start taking action, you need to clearly understand what kind of recovery method you will use. There are several ways to install the software: through the built-in update menu, through Recovery mode using the use of Recovery mode. ZIP-The choice of the specific path depends on the current state of your device and the final goals you set for yourself.
It is important to be aware of the risks associated with tampering with system files. Although the firmware process is debugged by the manufacturer, any manipulation of the software carries a potential risk of data loss. That is why backup is a critical step that should not be ignored under any circumstances.
⚠️ Warning: Before any manipulations, make sure that the battery is at least 60% charged. Interrupting the firmware process due to battery discharge can lead to irreversible damage to the system.
Preparation of the device and choice of firmware method
The first step to a successful upgrade is to determine the type of firmware your device needs. Redmi Note 4 has come in many different versions, and installing the wrong software can cause communication modules or touchscreen to fail. You need to know exactly the code name of your device: mdg for the global version or ido for the Indian version, although it is a global variation that is most common.
There are two main types of firmware: Recovery ROM and Fastboot ROM. The first option is ZIP-An archive that can be installed directly through the recovery menu without using a computer, if the current system is functioning at all. IMG, which requires a connection to a PC and the use of special software for deep flashing of all memory partitions.
If your phone is powered up and running consistently, but you just want to upgrade to Android, the easiest way to upgrade is to use Recovery. However, if the device goes into an endless bootloop or doesn’t boot at all, the only way to save it is to use Fastboot mode and the Mi Flash Tool.
- 📱 Recovery ROM — Suitable for scheduled system updates or reinstallation with a running menu.
- 💻 Fastboot ROM — necessary for the full recovery of the “brick” or change of the region with the unlocked loader.
- 🔄 OTA Update – automatic update “over the air”, the most secure, but depends on the servers of the manufacturer.
Determining the current software version and the type of processor is key. Go to Settings → About your phone and look closely at the processor information. For the Redmi Note 4, this is most often the Snapdragon 625, but there are versions on MediaTek that are categorically incompatible with each other.
Unlocking the bootloader: the need and the process
To install global firmware on a Chinese version of a device or to use custom recavators often requires unlocking the bootloader. This is a security mechanism by Xiaomi to prevent installation of untested software. Without an unlocked bootloader, you will not be able to flash the device through Fastboot if the firmware region is different from the current one.
The unlocking process requires you to link your Mi Account to your device and get a special permission from the company. This is not an instant procedure: after applying, you often have to wait from a few days to a week. SMS-The notification can be started technical actions to remove the lock.
To perform the operation, you will need the Mi Unlock Tool utility installed on a Windows computer. The phone is transferred to Fastboot mode by pressing the volume button when you connect the USB cable. The program reads the status of the device and, if authorized, removes protection, completely clearing the internal memory of the smartphone.
adb reboot bootloaderThis command allows you to put a compatible device into bootloader mode via USB debugging if the buttons are physically damaged. However, the classic method using volume buttons remains the most reliable. Remember that after unlocking the bootloader, some security features, such as Google Pay or banking applications, can stop working without additional manipulations to hide root rights.
⚠️ Warning: Unlock the bootloader automatically performs Wipe Data. All files, photos and applications will be deleted without recovery.
What to do if Mi Unlock Tool says "Waiting for authorization"?
Instructions: Firmware through Recovery (without PC)
This method is the easiest and most secure for ordinary users whose device is in working order. You will need to download the firmware file in.zip format, corresponding to your model, and place it in the root of internal memory. It is important that the file name does not contain Cyrillic characters and be renamed to update.zip for compatibility with older versions of the bootloader.
After you prepare the file, you need to switch to Recovery mode. To do this, turn off the phone and press the power button and the volume button at the same time. In the menu that appears, select a language (usually English or Chinese) and find Install update.zip or Select a file. The system will check the integrity of the archive and begin the installation process.
During installation, the Mi logo and progress bar can be displayed on the screen. Do not interrupt the process or try to restart the device, even if it seems to be hanging. Modern integrity control systems can take up to 10-15 minutes during the verification and application phase of patches.
☑️ Checklist for firmware through Recovery
Once the installation is completed successfully, the system will suggest restarting, and the first run after the upgrade may take longer than usual, as the applications are optimized and the system libraries are restructured, and if the phone is turned on and running correctly, the procedure can be considered complete.
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If the system writes “Can’t verify update” after you have firmware through Recovery, try renaming the file to update.zip and putting it in the download folder inside the internal memory, not the root.
Fastboot Firmware with Mi Flash Tool
Fastboot is the most powerful tool in the repair technician's arsenal, allowing you to completely rewrite all memory parts, including system, boot and user, USB-good quality cable and downloaded firmware in.tgz format (unpacked folder).
First, you need to install Qualcomm or Xiaomi USB Driver drivers on your computer. Without properly installed drivers, the Mi Flash Tool utility will not see the connected device. After installing the drivers, launch the program on behalf of the administrator, press the Refresh button and connect the phone in Fastboot mode (volume button down + power).
In the program interface, select the path to the unpacked firmware folder. Pay special attention to the choice of firmware mode at the bottom of the window: Clean All clears the data completely, Save User Data tries to save files (not recommended when changing regions), and Clean All and Lock locks the bootloader back. The last paragraph is only safe if you are flashing the original firmware for your region.
| Firmware mode | Data retention | Locking the loader | Recommendation |
|---|---|---|---|
| Clean All | No (Full reset) | No (Remains open) | Recommended for region change |
| Save User Data | Yes. | No. | Only for updating the version |
| Clean All and Lock | No (Full reset) | Yes (Closing) | Only for the original firmware |
Press Flash and wait until the process is complete. The program log will display the steps of writing partitions. Successful completion is indicated by the green success label in the Result column.
⚠️ Note: When selecting the option "Clean All and Lock" with inappropriate firmware (for example, Chinese on the Global apparatus), you will receive a "brick", which can only be restored through an authorized service center with a paid account.
Solving common mistakes and problems
In the process of firmware, users often encounter errors that can stop an inexperienced wizard. One of the most common problems is the Miss matching image and device error. It occurs when you try to flash firmware that is not intended for a particular processor or device model. Carefully check the code name (for example, gemini, markw, mdg) before starting the procedure.
Another common problem is hanging on the Mi logo after firmware, which may indicate damage to the data partition or conflict versions. Data/Factory Reset) via the Recovery menu. If this does not help, you may need to reflash the device again, selecting the full clean mode.
If your computer doesn’t see your phone in Fastboot mode, check Windows Device Manager.The device can appear as “Unknown Device” or "QUSB_BULK". In this case, you need to manually update the driver, indicating the path to the drivers of Xiaomi or Qualcomm. USB-cable USB 2.0 It also increases the chances of success.
- 🔌 Connection error - replace USB-cable or port, try another computer.
- 📉 Memory Error – Free up the space on the C disk where the Mi Flash Tool is installed.
- 🔒 Account Error – Make sure Mi Account is untied from the device before firmware.
In some cases, antivirus software can block the Mi Flash Tool or delete firmware files. During work, it is recommended to temporarily disable real-time protection. Also make sure that the path to the firmware folder does not contain Cyrillic, as this often causes error reading paths in the command line.
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90% of Redmi Note 4 firmware errors are due to incorrect firmware version selection (Global vs China) or faulty firmware. USB-cable.
Recovery after a failed firmware
If you've done something that's stopped responding to commands, stopped turning on, or rebooted constantly, don't panic. In most cases, you can restore the device if there's no physical damage to the memory chips. First of all, try resetting your Recovery mode and resetting your data. If the menu doesn't open, go to Fastboot mode.
For complex cases where the phone is not detected in Fastboot, EDL (Emergency Download Mode) mode may be required. Entering this mode on the Redmi Note 4 often requires disassembling the case and closing special contacts on the board (Test Points) or using a special cable. In EDL mode, the device is defined as Qualcomm HS-USB QDLoader 9008 and allows you to flash it even with a completely destroyed bootloader.
However, firmware through EDL requires an authorized Xiaomi account that is only available to official service centers. There are workarounds and paid services on the Internet that provide access to firmware through EDL, but they carry additional risks. So always try to complete the firmware process with standard methods through Fastboot.
Remember that there is no hardware reset button on the Redmi Note 4, so recovery is only possible by software methods. If all software methods are exhausted and the phone does not show signs of life (no vibration, reaction to charging, heating the processor), it may be the problem lies in the hardware, for example, in the failure of the power controller.