Xiaomi’s Redmi line of smartphones has been hugely popular for years for their value for money. However, like any complex electronics, they can encounter software failures that require low-level intervention.
For owners of the Redmi 4X model, understanding how this mode works is especially relevant, as this smartphone is often used for firmware experiments or needs to be restored after unsuccessful updates. Fastboot is a debugging protocol that allows you to transfer data between your computer and phone, as well as execute low-level commands.
Unlike normal operating mode, Fastboot doesn't boot the Android operating system, which allows you to change memory partitions, install new firmware versions, or unlock the bootloader, and if you see a picture of a rabbit fixing an android on your screen, that's the state of the device.
What is the Fastboot mode?
Fastboot mode is part of an Android developer toolkit built directly into the device bootloader. On Xiaomi smartphones, including the popular Redmi 4X, this mode serves as a gateway to interact with the phone's internal memory, bypassing the operating system, and this is where the flashing process takes place, where old system files are replaced with new ones.
The main function of this state is to execute commands sent from a computer through a computer. USB-When you connect your Fastboot phone to your PC, the computer's operating system recognizes it as an external debugging device. This allows you to use Mi Flash or the command line. ADB Directly write data to the system, boot and recovery sections.
⚠️ Warning: Being in Fastboot mode gives you complete control of the device. Misrecording incompatible files can cause a smartphone known as a “brick” to fail completely».
It is important to distinguish Fastboot from Recovery mode. If Recovery is a recovery menu with a limited set of functions (reset, update with ZIP), then Fastboot is direct access to hardware. It is through this protocol that the bootloader is officially unlocked, which is necessary for installing custom firmware.
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Use the original. USB-cable USB 2.0 on the computer motherboard for stable connection during firmware to avoid data transmission errors.
How to Get Fastboot Mode on Redmi 4X
There are several ways to get into fast boot mode on the Redmi 4X, and the most common and safe method is to use a combination of physical buttons on the device that is turned off, which works even if the operating system is completely inoperable.
To enter, you need to turn off your smartphone completely. Make sure the screen is off and the device is not making sounds. Then press both the volume down button (Down key) and the power button at the same time. Hold them until the characteristic image appears on the screen.
- 🐇 You will see the Mi Bunny logo that fixes the Android robot.
- 📱 The screen will clearly show the inscription. FASTBOOT orange-blue.
- 🔌 Connecting the cable to the PC, you will hear the sound signal of connecting new equipment.
There is also a software way to log in if the system is stable. You can use ADB (Android Debug Bridge) commands, which requires you to enable USB debugging in the Developer menu and enter the adb reboot bootloader command in the computer's command line.
Instructions for exiting Fastboot mode
Often users accidentally fall into this mode and do not know how to return to normal. exiting from Fastboot to Redmi 4X usually does not require complex manipulation. The easiest way is to force the reboot through holding the power button.
You need to hold the power button long enough, depending on the state of the system, it can take 10 to 20 seconds, the screen goes out, the device vibrates, and the standard MIUI boot starts.
If the power button fails to respond or the phone returns to Fastboot mode after the Mi logo, the problem may be sticking the volume buttons or damaging the system files, in which case you may need to flash it again.
☑️ The exit algorithm from Fastboot
⚠️ Warning: If the phone cycles to restart and hits the Fastboot again, don’t try to turn it off endlessly with a button.This may indicate damage to the boot partition that requires flashing.
Redmi 4X Firmware via Fastboot
Using Fastboot mode to install firmware is the most reliable way to restore a smartphone. Redmi 4X (codenamed santoni) requires the official Mi Flash Tool utility and the corresponding Fastboot firmware with the.tgz extension.
The process starts with getting your computer ready, and you need to install the Xiaomi USB Driver and unpack the firmware archive into the root of the drive so that the path doesn't contain Cyrillic characters. Once you connect your phone to Fastboot, the program has to identify the device.
| Type of firmware | File extension | Method of installation | Data retention |
|---|---|---|---|
| Recovery | .zip | Through the Recovery menu | Maybe. |
| Fastboot | .tgz | Through the Mi Flash Tool | No (usually) |
| Recovery (OTA) | .zip | Update by air | Yes. |
| Fastboot (Clean) | .tgz | Complete cleaning (Clean All) | No. |
In Mi Flash, it is important to choose the correct firmware method. The clean all option completely erases data, which is recommended when switching between Android versions or regions. The save user data option tries to save files, but can lead to errors if the partition structure has changed.
Where to find firmware for Redmi 4X?
Unlock the bootloader via Fastboot
One of the main reasons for using Fastboot on Xiaomi is to unlock the bootloader (Unlock Bootloader), which is necessary to install custom recavators (for example, TWRP) and obtain superuser rights (Root).
The process of unlocking on Redmi 4X is officially supported by the company, but requires preliminary preparation. You need to link your Mi Account account to the device and get permission through the special Mi Unlock Tool utility on your computer.
Without an unlocked bootloader, you can’t modify the system partition, but it’s worth remembering that unlocking drops all data from the phone and can affect some banking applications or features of Widevine L1 (video quality in streaming services).
- 🔓 Unlocking allows you to install global firmware on Chinese versions of phones.
- ⚙️ Access to deep customization of the system and core.
- ⚠️ The manufacturer’s warranty may be cancelled after this procedure.
Typical errors and their solution
When working with Fastboot on Redmi 4X The problem is that the computer may not see the phone, or the firmware process may be interrupted by a certain percentage. USB-cable.
If the device manager displays the device as «QUSB_BULK» Or it has a yellow exclamation point, you need to manually update the driver by choosing the path to the folder with Xiaomi drivers. USB 2.0 instead 3.0.
The error “Missmatching image and device” indicates that you are trying to flash the firmware intended for another model or region, or the version of the bootloader does not match the firmware version, in which case you need to download the current image specifically for santoni.
⚠️ Warning: Interrupting the write process to persist or modem may result in loss IMEI Do not disconnect the cable until the message "Success" appears".
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90% of Fastboot Connection Problems Are Replaced USB-cable for quality original accessory and installation of current drivers from the official website.