Fastboot Mode on Xiaomi Redmi 8: A Complete User Guide

Have you ever seen a black screen with a green robot and Fastboot Mode on your Xiaomi Redmi 8? This mode is often a headache for beginners, but it’s actually a powerful tool for power users. Fastboot (or “fast boot”) is a special protocol that allows you to interact with the hardware of your smartphone directly, bypassing the Android operating system. It is used to install custom firmware, unlock the bootloader, restore a “bricked” device, and even diagnose hardware problems.

On the Redmi 8 (model M1908C3JG/M1908C3JH/M1908C3JI), Fastboot mode is activated both accidentally (for example, when you press the buttons incorrectly), and purposefully - for firmware through the Mi Flash Tool or work with ADB. But why is it so important? The fact is that without this mode it is impossible to perform most of the "deep" operations with the device: from unlocking the loader to flashing the camera module. In this article, we will analyze all the nuances of working with Fastboot on the Redmi 8 in 2026, including the typical ways of exiting the smartphone, and the "boot" errors from the boot mode.

What is Fastboot and Why You Need It on Redmi 8?

Fastboot mode is a low-level interface between the hardware of a smartphone and a computer. Unlike the usual Recovery Mode, where actions are performed through an on-screen menu, Fastboot requires a PC connection and the use of the command line (ADB/Fastboot). On Xiaomi Redmi 8, it serves to:

• 🔓 Unlocking the bootloader (bootloader) - a mandatory step before installing custom firmware (LineageOS, Pixel Experience, etc.).
• 📥 Firmware official / unofficial software via Mi Flash Tool or fastboot flash.
• 🛠️ Recovery of the device after failures ("brick") when the system does not boot.
• 🔍 Diagnostics of hardware components (for example, checking the operation of eMMC memory or Wi-Fi module).
• ⚙️ Changes to memory partitions (for example, to increase size) /system custom-made).

It is important to understand that Fastboot is not the same as EDL Mode (Emergency Download Mode), which is used to “reanimate” completely dead devices through authorized service tools (Qualcomm HS-USB QDLoader 9008), while Fastboot is available to anyone and does not require special hardware.

On Redmi 8, the mode is activated by a combination of buttons or the command adb reboot bootloader, and the screen of the smartphone displays the Mi Bunny logo with a cable connected to the stomach and the inscription FASTBOOT at the bottom, which is a signal that the device is ready to receive commands via fastboot on the computer.

How to Sign In to Fastboot on Xiaomi Redmi 8: All Ways

There are three main ways to activate Fastboot Mode on Redmi 8. The choice of method depends on the state of the device: whether it works normally, hung on the logo or does not respond to buttons at all.

Method 1: Through a button combination (hardware method)

The most universal way that works even if the smartphone does not turn on:

1. Turn off Redmi 8 (press the power button for 10 seconds if it freezes).
2. Press and hold the Volume Down button.
3. Without letting go, connect your smartphone to your computer through USB-cable (or press the power button).
4. Hold Volume Down until the screen with Fastboot Mode appears.

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If your smartphone doesn’t respond to the buttons, try using another one. USB-A cable (preferably original from Xiaomi) or a port on a computer. Cheap cables often don't transmit data, just charge.

Method 2: Through ADB (if the smartphone is enabled)

If Redmi 8 is working, but you need to reboot to Fastboot for firmware or diagnostics:

1. Turn on USB Debugging in Settings: Go to Settings → About Phone → MIUI Version (click 7 times to activate Developer Mode), then go back to Settings → Additional → Developer → Debugging over USB.
2. Connect your smartphone to your PC and confirm the debugging permission.
3. Open the command line (CMD) and type: adb reboot bootloader

Method 3: Using the Mi Flash Tool (automatically)

If you are running Redmi 8 through the official Mi Flash Tool, the program will transfer the device to Fastboot after you connect.

1. Install the Mi Flash Tool and Qualcomm drivers on your PC.
2. Turn off your smartphone and connect it to your computer, holding Volume Down.
3. Start the Mi Flash Tool – the device will be determined as COM-port.

Differences between Fastboot and Recovery Mode on Redmi 8

Many users confuse Fastboot and Recovery Mode, but these are fundamentally different modes with different features. Below are the key differences for the Xiaomi Redmi 8:

On Redmi 8 Recovery Mode, activated by holding the Volume Up + Power button when the smartphone is off. In it, you will see menus with Reboot, Wipe Data, Apply update from ADB, etc. Fastboot does not have a graphical interface - only a black screen with a logo and waiting for commands from the PC.

Typical Fastboot Errors on Redmi 8 and How to Fix Them

Fastboot on Xiaomi Redmi 8 is often accompanied by errors, especially for beginners.

1. The device is not defined in Fastboot (waiting for device)

If you see an empty list after you enter the fastboot device command, the reasons may be as follows:

• 🔌 Cable/Port Problems: Use Xiaomi’s Original Cable and Port USB 2.0 (on the back of the PC).
• 🖥️ No drivers: install Mi USB Driver or Qualcomm HS-USB QDLoader 9008.
• 🔄 Wrong Mode: Make sure the smartphone screen is displayed FASTBOOT, not EDL.

2. FAILED Error (remote: 'Flashing is not allowed in Lock State')

This error means that the bootloader is locked.

1. Unlock the bootloader through the official Mi Unlock Tool (requires a binding Mi Account and wait 7-30 days).
2. If you have already unlocked, but the error remains, try the command: fastboot oem unlock-go (works on some versions of Redmi 8).

FAILED error (remote: 'Partition not found')

This occurs when you try to flash a non-existent partition (for example, fastboot flash persist img when the partition persist is not in the table).

4.The smartphone got stuck in the Fastboot after firmware

If Redmi 8 doesn’t leave Fastboot Mode after surgery, try:

• 🔄 Reboot the device with command: fastboot reboot
• 📵 Turn off the cable and hold the power button for 20 seconds.
• 🛠️ Recovery: Fastboot Flash Recovery recovery.img (Download the official recovery.img for your version MIUI).

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If the smartphone doesn’t turn on after firmware in Fastboot, don’t panic! 90% of the time, the problem is solved by re-running the full firmware package through the Mi Flash Tool (select the “clean all and lock” option).

How to exit Fastboot on Redmi 8: step-by-step instructions

If you accidentally hit Fastboot Mode or have completed the firmware, but the smartphone does not reboot automatically, use one of the ways to exit:

Method 1: Standard Resetting

The simplest method is:

1. Hold the power button for 10-15 seconds until the screen goes out.
2. Release the button – the smartphone should restart in normal mode.

Method 2: Through the Fastboot command

If the smartphone is connected to the PC:

1. Open the command line and type in: fastboot reboot
2. If you need to boot up to Recovery, use: fastboot reboot recovery

Method 3: Forced exit (if the smartphone does not respond)

If Redmi 8 is stuck in Fastboot and doesn’t respond to commands:

1. Turn it off. USB-cable.
2. Press the power button + increase volume for 20 seconds.
3. Release the buttons – the device must restart or log in to Recovery.

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If after leaving Fastboot, the smartphone boots into an infinite loop (bootloop), try resetting via Recovery: select Wipe Data → Wipe All Data. This will delete all data, but return the workability.

Security when working with Fastboot: what not to do

Fastboot mode offers a lot of options, but also high risks of “bricking” Redmi 8.

⚠️ Note: Never flash files that are intended for other Xiaomi models (e.g., for example, boot.img from the Redmi Note 8). This will damage the boot partition and inability to boot the system.

• 🚫 Do not interrupt the firmware (cable shutdown, battery pulling out).This can damage the eMMC partition, and the smartphone will become a brick».
• 🔒 Do not unlock the bootloader unless you plan to install custom software.
• 📡 Do not use unofficial firmware without checking reviews. Some builds contain spyware or are unstable.
• 🔋 Do not stitch with low battery charge (less than 30%) and the risk of shutting down during the process is extremely high.

Before any operation in Fastboot, back up your important data. Even a simple command from fastboot erase userdata will delete all photos, contacts, and apps.

Useful Fastboot commands for Xiaomi Redmi 8

Below is a list of the most in-demand commands to work with Redmi 8 in Fastboot mode. All commands are entered in Command Prompt (CMD) after the device is connected.

For the firmware of the full package MIUI via Fastboot, use the script flash_all.bat (for Windows or flash_all.sh (for Linux/Mac), It comes with the official firmware:

fastboot flash boot boot.img


fastboot flash recovery recovery.img




fastboot flash system system.img




fastboot reboot

For Redmi 8, it is critical to use the firmware specifically for your modification (M1908C3JG, M1908C3JH or M1908C3JI). You can find out the exact model on the sticker under the battery or in the settings (Settings → About Phone → Model).

FAQ: Frequent questions about Fastboot on Xiaomi Redmi 8