Fastboot Mode on Xiaomi Redmi Note 9S: Full User Guide

Xiaomi Redmi Note 9S — It's one of the most popular mid-range smartphones, but even a reliable device like this sometimes has problems, from accidental crashes to having to reflash the system, and in such cases, Fastboot mode, a powerful tool for low-level device management, comes to the rescue. However, many users are afraid to use it for fear of “bricking” the phone or losing data. 9S, How it works and when it is justified – and when it is better to contact the service.

Unlike the standard Recovery Mode, Fastboot allows you to interact with the bootloader directly through the computer, which opens up opportunities for unlocking the bootloader, installing custom firmware, or even “resuscitating” the phone after a serious crash. But with power comes responsibility: wrong actions in Fastboot can lead to the loss of warranty or complete inoperability of Redmi Note. 9S. Therefore, before working with this regime, it is important to understand its principles and pitfalls.

In this article, you will find not only the theoretical basis, but also practical instructions with step-by-step actions, risk warnings and safety tips. EDL Mode (emergency mode), and when to use each of them.If you plan to unlock the bootloader, flash Redmi Note 9S Or just want to be prepared for emergencies – this is the stuff for you.

What is Fastboot and Why You Need It on Redmi Note 9S

Fastboot is an Android device bootloader interaction protocol that allows you to execute low-level commands via a computer connection.On Xiaomi Redmi Note 9S (codename curtana, this mode is integrated into the default system and serves to:

• 🔓 Unlocking the bootloader (mandatory step before installing custom firmware or root rights).
• 📥 Install official and unofficial firmware via fastboot flash.
• 🔄 System Recovery after Failures When Recovery Mode Is Unavailable.
• 🛠️ Check the status of hardware components (for example, memory or display testing).
• 📡 Updates of radio modules (modems) to improve communication.

The main difference between Fastboot and standard Recovery Mode is that it can work with the device via the computer’s command line, which gives you more control, but requires specific commands and caution. For example, the fastboot oem unlock command unlocks the bootloader, and the fastboot flash boot overwrites the partition with the kernel of the system. 9S The mode is activated by a combination of buttons or through ADB, More about this in the next section.

It's important to understand that Fastboot isn't a magic wand for all problems, it's useless if you:

• 🚫 The device is not fully powered on (needed) EDL Mode).
• 🚫 Damaged motherboard (repair required).
• 🚫 bootloader is blocked and Mi Account is not tied (authorization is required).

How to Sign In to Fastboot on Redmi Note 9S: 3 proven methods

Entrance to Fastboot on Xiaomi Redmi Note 9S There are several ways to do this. The method depends on the state of the device, whether it's working normally, whether it's loading into the system, or whether it's stuck on the logo. Here are three reliable options, from the simplest to the more technical.

Method 1: Button combination (for switched off phone)

If the phone is turned off or got stuck, use the hardware buttons:

1. Turn off the Redmi Note. 9S (clamp down on power. + Increase volume by 10 seconds).
2. Press both Power and Volume Reduction at the same time.
3. Hold for 5-7 seconds until a screen with a sign appears. FASTBOOT and a picture of a rabbit in a hat.

Method 2: Recovery Menu (if phone is switched on)

If the device is booting, but you need to go to Fastboot for firmware:

1. Turn off the phone.
2. Press Power + Volume Up to Enter Recovery Mode.
3. In the recovery menu, select Reboot to Fastboot (use volume buttons for navigation and Power for confirmation).

Method 3: Command ADB (power-user)

If the phone is debugging on USB And it's connected to a computer:

adb reboot bootloader

This command will instantly reboot the device in Fastboot. Make sure that Xiaomi drivers are installed, and the developer settings activate the option Unlock OEM.

Install Xiaomi drivers on PC|Download Mi Flash Tool or Platform Tools|Check the battery charge (minimum 50%)|Disable the antivirus (can block commands)|Make a backup copy of the data-->

On the Redmi Note. 9S Logging into Fastboot via a button combination may not work if an unofficial recavery has been installed previously (for example, for example, TWRP). In this case, use the command. ADB Or re-check the official loader.

Fastboot's main commands for Redmi Note 9S: what

After logging in to Fastboot, you can control the Redmi Note. 9S The following is a table with the main commands and their purpose, all commands are entered in the terminal (or cmd) after connecting the phone to the PC.

For firmware official global firmware on Redmi Note 9S The Mi Flash Tool is usually used, which automates the process. However, if you need to flash individual partitions (e.g. recovery or modem), fastboot flash commands will be useful:

fastboot flash recovery twrp.img


fastboot reboot recovery

Warning about cleaning commands: commands like fastboot erase permanently delete data. 9S This could lead to:

• 📵 Poose. IMEI (if the section is erased modemst1/modemst2).
• 🔒 Lock the loader (if the section frp is erased).
• 📱 Complete inoperability (if the boot partition is damaged).

💡

Before using fastboot erase or fastboot format commands, always check the partition correctness through fastboot getvar all. This will show the current memory structure and help avoid errors.

Unlock the bootloader on the Redmi Note 9S via Fastboot: step-by-step instructions

Unlocking the bootloader is a mandatory step for installing custom firmware, root rights or alternative recoveries (for example, TWRP). Xiaomi Redmi Note 9S This process is strictly controlled by the company and requires the binding of the Mi Account. Below is the current instructions for 2026.

Step 1: Prepare your Mi Account

Xiaomi requires users to link the device to an account before unlocking.

1. Register for Mi at account.xiaomi.com.
2. On your phone, go to Settings. → Mi Account and log in.
3. Turn on data synchronization and confirm the phone number.

Step 2: Enabling Developer Mode and Unblocking OEM

Without this step, the fastboot oem unlock command will not work:

1. Go to Settings. → The phone.
2. Click 7 times on the MIUI version to activate the developer mode.
3. Back to Settings → Additionally. → For developers.
4. Activate options: Unblock OEM (Debugging by the way! USB

Step 3: Unlocking with Mi Unlock Tool

Download the official Mi Unlock Tool from Xiaomi (Windows only).

1. Connect the Redmi Note 9S PC-to-PC Fastboot mode.
2. Start the Mi Unlock Tool and log in to your Mi Account.
3. The utility will check the ability to unlock. If the device is new, it will take 7 days to wait ( Xiaomi policy).
4. After waiting, press Unlock – the bootloader will be unlocked.

⚠️ Attention: Unlock the bootloader on the Redmi Note 9S It resets all the data on the device, and it also voids the warranty (if it's still valid), and once it's unlocked, the phone will show a warning when it boots, which is normal.

Redmi Note Recovery 9S Fastboot: When to do it and how to do it

Fastboot Mode is the Last Chance to Bring Redmi Note Back 9S to life if:

• 📵 The phone does not turn on or hovers on the Mi logo.
• 🔄 It has been broken since the update (bootloop).
• 📱 The device was “bricked” by an unsuccessful firmware.
• 🚨 The system is damaged by viruses or incorrect modifications.

For recovery, you will need an official firmware for the Redmi Note 9S (codename curtana) and Mi Flash Tool:

• 📥 Firmware: Site MIUI (Choose the Fastboot version for your region).
• 🖥️ Mi Flash Tool: Xiaomi Forum.

Step-by-step instructions for restoration

1. Unpack the archive with firmware in a folder without Cyrillic characters (for example, C:\curtana_fastboot).
2. Install the Mi Flash Tool and run it on behalf of the administrator.
3. Connect the Redmi Note 9S Fastboot to PC mode.
4. In the utility, click Select and specify the path to the folder with the firmware.
5. Select firmware mode: Clean all (recommended for serious failures) Clean all and lock + Save user data - saving data (not always stable).

Flash

⚠️ Note: If you have a Redmi Note 9S Does not turn on or shows an Invalid image error, check: - Compliance with the model firmware (curtana for Redmi Note) 9S). - Integrity of the downloaded archive (check the hash amount). USB (Try another cable or port).

💡

Use firmware specifically for your region! Installing firmware for another region (like Chinese on the global model) can lead to network or language pack issues.

How Fastboot is Different from EDL Mode on Xiaomi

Xiaomi users often confuse Fastboot and EDL Mode (Emergency Download Mode) Although both modes are designed to restore the device, they work differently and are used in different scenarios:

On the Redmi Note. 9S EDL Mode is rarely required – only if the device does not fully respond to buttons and is not defined in the Fastboot. EDL usually:

1. Disassemble the phone and close the testpoint (special contacts on the motherboard).
2. Connect the device to a PC with Qualcomm 9008 drivers installed.
3. Use the Mi Flash Pro utility with an authorized account (new Xiaomi models require permission from the manufacturer).

Important: Entrance EDL on modern Xiaomi, including Redmi Note 9S) Unofficial methods (e.g., through deep flash cable) can cause hardware damage. If you're not a seasoned user, you'd better contact a service center.

Frequent Fastboot errors on Redmi Note 9S and how to fix them.

Work with Fastboot on Xiaomi Redmi Note 9S It can be accompanied by mistakes, especially in beginners. Below are common problems and ways to solve them.

Error 1: “Waiting for device” in the command line

The reason: the PC can't see the device.

• 🔌 Check it out. USB-cable (use the original cable).
• 🖥️ Install Xiaomi drivers or ADB/Fastboot (download from Google).
• 🔄 Reconnect the phone to another USB-port (preferably) USB 2.0).
• 🛠️ In Device Manager, check if Redmi Note is detected. 9S How to use Android Bootloader Interface.

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

Reason: bootloader locked. Solutions:

• 🔓 Unlock the bootloader through the Mi Unlock Tool (see section above).
• 📱 If unlocking is already done, but the error remains – check if the settings have reset after the restart.

Error 3: "Invalid sparse file format at header magi"

Reason: The firmware file is damaged.

• 📥 Download the firmware again (check the hash amount).
• 📁 Unpack the archive in a folder without spaces and Cyrillic (for example, C:\rom\curtana).

Error 4: The phone doesn't come out of Fastboot

Cause: Firmware failure or damage to boot partition.

• 🔄 Force the phone to restart by clamping the power for 15-20 seconds.
• 📱 If it doesn’t work, run the official firmware through the Mi Flash Tool (Clean All mode).

⚠️ Note: If you have a Fastboot Redmi Note 9S If you see a No command error or if it's dead, don't try to flash it again without a diagnosis, it could be a sign of misc partition damage or hardware failure.

FAQ: Frequent Fastboot Questions on Redmi Note 9S