How to block the bootloader on Xiaomi Redmi Note 8 Pro: all the ways and nuances

Locking the bootloader on the Xiaomi Redmi Note 8 Pro is a procedure that may be necessary after experimenting with firmware, custom Recovery or obtaining root rights. Despite the fact that most users tend to unlock the bootloader for advanced features, the reverse process is equally important: it restores factory protection, improves the stability of the system and allows you to use official updates without the risk of “brick”.

In this article, we will discuss all the current methods of blocking the bootloader for the Redmi Note 8 Pro (codename begonia), including the official method through the Mi Unlock Tool, alternative solutions for devices with corrupted software, as well as the nuances of working with different versions of firmware. We will pay special attention to critical errors that can turn a phone into a brick, and how to avoid them. If you have previously changed system files or installed informal firmware, blocking the bootloader may require additional steps, which we will also consider.

Why might I need to lock the loader?

The bootloader on Xiaomi smartphones is blocked by default, a measure of protection against unauthorized changes in the system.

• 🔧 Install custom firmware (LineageOS, Pixel Experience, etc.)
• 🛠️ Getting root rights through Magisk or SuperSU
• 🔄 Use of alternative rivers (TWRP, OrangeFox)
• 📱 Modifications of system applications and kernel

But why block it back? Here are the key reasons:

• 🔒 Security: A blocked bootloader protects against malware that could change system partitions.
• 📲 Official Updates: Some of the OTA-updates from Xiaomi refuse to install on devices with unlocked bootloader.
• 🛡️ Warranty service: Service centers may refuse repairs if they find traces of a system hack.
• 🔄 Stability: Castom firmware sometimes conflicts with hardware, leading to accidental reboots or overheating.

⚠️ Attention: Locking the bootloader on a device with custom firmware installed or modified boot.img You can't boot the system, and you have to return the stock firmware before the procedure!

If you are planning to sell or give the phone away, locking the bootloader is also recommended – it will shed all traces of your manipulation of the system and return the device to the “factory” state from a security point of view.

Preparing the device for locking the loader

Before you start blocking, you need to follow a few critical steps, and neglecting them can lead to data loss or device failure.

First, back up all the data, locking the bootloader will reset the device to factory settings by removing:

• 📸 Photos and videos (including screenshots)
• 📱 Contacts, SMS call logs
• 🎵 Music, downloads and documents
• 🎮 Application data (save games, settings messengers)

For backup, use:

• 🖥️ Mi Cloud (if your Xiaomi account is tied)
• 📱 Local copying on PC through MTP or ADB
• 🔄 Apps like Swift Backup (require root) or Titanium Backup

Second, return the stock firmware. You can only lock the bootloader on official Xiaomi software, if you have custom firmware installed:

1. Download the latest stable version MIUI Redmi Note 8 Pro from en.miui.com.
2. Fastboot or Recovery (depending on the current state of the device).
3. Make sure the system boots up without errors.

Create a backup copy of the data|Install the stock firmware|Check the system's performance|Unplug Google Account (if you plan to sell)|Charge your phone at least 60%-->

Third, check the status of the Mi Account. To block the bootloader through the official tool you will need:

• 📱 A Xiaomi account linked to the device.
• 🔑 Confirmed phone number and email.
• 🕒 No unlock/lock restrictions (for example, if you recently unlocked the bootloader, a waiting timer may be in effect).

The official method: locking through the Mi Unlock Tool

The most reliable way to block a bootloader is to use Xiaomi’s official Mi Unlock Tool, which is suitable for devices that:

• ✅ Stock firmware installed MIUI.
• ✅ No modified system files.
• ✅ Xiaomi account tied to phone.

Step-by-step:

1. Download Mi Unlock Tool from the official website en.miui.com/unlock (Choose the latest version for Windows).
2. Install drivers: Connect Redmi Note 8 Pro to PC in Fastboot mode (clip Power) + Volume down when phone is off. Check in Device Manager that the phone is defined as Android Bootloader Interface. If there are no drivers, download Mi Phone Manager - it will install them automatically.

Launch the Mi Unlock Tool

Xiaomi

Connect the phone.

Fastboot

Press Lock.

Confirm the action.

Once successfully locked, the phone will automatically restart. The first boot can take up to 10 minutes - that's OK. If the device has been hanging on the Redmi logo for longer than 15 minutes, try going to Recovery. + Loudness up and make Wipe Data.

⚠️ Note: If you have previously changed boot or recovery partitions, locking the bootloader may cause the device to permanently fail. EDL-Download emergency mode, which requires an authorized Xiaomi account or contacting a service center.

Alternative methods of blocking the loader

If the official method does not work (for example, due to errors in the Mi Unlock Tool or the absence of a linked account), alternative methods can be used. ADB and Fastboot.

Method 1: Blocking through Fastboot commands

This method is suitable for devices with stock firmware, but without a tied Xiaomi account.

• 🖥️ Computer with installed ADB and Fastboot.
• 📱 Phone in Fastboot mode.
• 🔑 File. antirollback.img For your model (can be extracted from the official firmware).

Instructions:

fastboot devices # Check the connection


fastboot getvar anti # Check the current status of anti-rollback




fastboot flash anti antirollback.img # Firmware anti-rollback (if required)




fastboot oem lock # bootloader lock command




fastboot reboot

Method 2: Firmware through EDL (Emergency mode)

If the phone does not boot or the Mi Unlock Tool is critical, you can use the device. EDL-This method requires:

• 🔧 Xiaomi Authorized Account to Access Mi Flash Pro.
• 📂 Full firmware in.tgz format for Redmi Note 8 Pro.
• 🔌 Cable USB Type-C with support EDL (Sometimes a special testpoint is required").

Process:

1. Transfer the phone to EDL-Mode (close contacts on the board or use the command adb reboot edl if the phone is still working).
2. Connect to your PC and check that the device is defined as Qualcomm HS-USB QDLoader 9008.
3. Run Mi Flash Pro, select firmware and press Flash.
4. After the firmware, the loader will be automatically blocked.

💡

If you do not have an authorized account for EDL, You can try using the XiaomiTool utility V2 (unofficial), but it is risky - high probability of getting a brick".

Method 3: Use of custom scripts

There are scripts on the network (for example, lock_bootloader.bat), They're automating the lockdown process:

• ⚠️ They often contain outdated commands or malicious code.
• ⚠️ There is no guarantee that the script is suitable for your firmware version.
• ⚠️ The risk of damaging boot partitions is higher than with manual commands.

If you decide to use the script, first:

1. Check his code for suspicious commands.
2. Create a full backup with Fastboot (fastboot backup).
3. Use a virtual machine to run the script (in case it contains malware).

Frequent mistakes and their solutions

The process of locking the bootloader is often accompanied by errors, especially if the device has previously undergone modifications.

Error 1: "This device is locked"

This error appears if you are trying to block an already blocked bootloader.

• Check the current status of the bootloader with the command:

fastboot oem device-info

If the output has a line Device unlocked: false, the bootloader is already blocked.

Error 2: "Anti-rollback check fail"

This error is due to the Anti-Rollback mechanism, which prohibits rollbacks to older versions of firmware.

• Please use the same or newer version that was installed earlier.
• Use XiaomiTool to bypass the restriction (risky!).
• Contact the service center for the firmware through EDL.

Error 3: The phone will not turn on after locking

If after locking the bootloader the device does not boot (hangs on the logo or goes to the bootloop), the reasons may be:

• 🔴 Inconsistency between firmware and loader version.
• 🔴 Damaged system partitions (boot, system).
• 🔴 Remains of custom recapvery or root.

Decisions:

1. Try to go to Recovery and make Wipe Data.
2. Sweep the stock firmware through Fastboot:

fastboot flash boot boot.img


fastboot flash recovery recovery.img




fastboot flash system system.img




fastboot reboot

1. If nothing helps, run the full firmware through EDL.

Mistake 4: Mi Unlock Tool Requires Waiting

If the utility shows a timer (like "Wait 72 hours"), it means you've recently done a bootloader operation, and you can't get around that limitation, you'll have to wait.

• Link your phone to your Xiaomi account and use it actively (data synchronization speeds up the timer unlocking).
• Check that the phone has Developer Options and Unblocking enabled OEM.

Locking the bootloader without losing data: myth or reality?

Many users are wondering if it is possible to block the bootloader without resetting data. Unfortunately, on the Xiaomi Redmi Note 8 Pro, this is not possible for the following reasons:

• 🔒 Locking the bootloader resets the encryption keys, which makes the data in the section /data inaccessible.
• 📱 Xiaomi has deliberately implemented this mechanism to protect user data when the state of the bootloader changes.
• 🔧 Any attempts to circumvent reset (for example, through modified scripts) lead to unstable operation of the system.

However, there are ways to minimize the loss:

• 📁 Create a backup copy through TWRP (if it is installed) before the lock.
• ☁️ Upload important files to the cloud (Google Drive, Mi Cloud).
• 🔄 Use it. ADB Pull to copy data to a PC:

adb pull /sdcard/ C:\Backup\Redmi_Note_8_Pro\

If it is critical to save data, consider blocking alternatives:

• 🔒 Install stock firmware without locking the bootloader (this will return most functions, except for the main ones). OTA-update).
• 🛡️ Use Magisk to hide root rights from applications that require a locked bootloader (e.g. banking apps).

What to do after a successful lockdown?

After locking the bootloader, it is recommended to follow several steps to ensure the stability of the device and restore functionality:

1. Checking of performance

• 📱 Make sure the phone boots without errors.
• 🔋 Check the main functions: calls, mobile Internet, Wi-Fi, Bluetooth.
• 🎵 Test multimedia (camera, speakers, microphone).

2. Firmware update

• Go to Settings → About Phone → Update the system and install the latest security patches.
• If OTA-Update does not come, download the full firmware package from the official site and install it through Recovery.

3. Data recovery

• ☁️ Restore backups from the cloud (Mi Cloud, Google Drive).
• 📂 Transfer local copies of files back to your phone.
• 🔑 If you used Titanium Backup, restore your application data (requires root, but the root bootloader will be lost after blocking).

4. Security setting

• 🔐 Enable device encryption in Settings → Security → Encryption.
• 👤 Set up unlocking by fingerprint or face.
• 🔑 Install a reliable pattern lock or PIN-code.

💡

Once the bootloader is locked, be sure to check the status of the device in the Mi Unlock Tool - it should show "Locked." If the status has not changed, repeat the procedure or re-sweeten the firmware.

5. Checking the status of the loader

To make sure that the bootloader is actually locked:

1. Restart your phone in Fastboot mode.
2. Connect to the PC and execute the command:

fastboot oem device-info

The conclusion should include a line:

Device unlocked: false

FAQ: Frequent questions about bootloader lockdown