bootloader on Xiaomi Redmi: a complete guide for users

If you are the owner of the Xiaomi Redmi smartphone and have ever tried to install custom firmware, get root rights or restore the “brick” after an unsuccessful update, then you probably encountered the term “bootloader” (or bootloader). This small but critical component controls the process of starting the device, from powering on to loading the operating system. MIUI.

Unlike many other manufacturers, Xiaomi blocks the bootloader on its devices by default. This is done for security reasons: it is harder to steal data from a lost phone or install malware. However, for enthusiasts who want to expand the functionality of their Redmi, unlocking the bootloader is the first step. In this article, we will take a detailed look at what a bootloader is, why to unlock it, how to do it safely, and what pitfalls can be encountered along the way.

What is a bootloader and how does it work on Xiaomi Redmi?

A bootloader is a low-level program that runs before the operating system, and its main task is to verify the integrity of the device components and hand over control to the Android kernel. On Xiaomi Redmi smartphones, the bootloader performs several key functions:

• 🔒 Firmware signature verification – without unlocking, the bootloader will refuse to run unofficial or modified versions MIUI.
• 🛡️ Protection against unauthorized access – blocks attempts to reflash the device without the owner’s knowledge.
• 🔄 System Restore – Fastboot allows you to reinstall firmware even if Android doesn’t boot.

On Xiaomi devices, the bootloader is closely integrated with the Mi Account security system, which means that unlocking it will require linking the phone to a Xiaomi account and obtaining permission from the company’s servers, without which any attempts to flash custom software will lead to an Anti-Rollback error or a complete lockdown of the device.

It's important to understand that the Redmi bootloader is not just a "protection barrier"; it's also responsible for:

• 📱 Running Fastboot and Recovery modes – without it it it is impossible to enter the service menu.
• 🔄 Air firmware update (OTA) — bootloader checks the digital signature of updates before installing them.
• 🛠️ Diagnostics of hardware components - when hanging on the Mi logo, the problem can lie in it.

Why unlock the bootloader on Xiaomi Redmi: pros and cons

Unlocking the bootloader opens up new possibilities for the user, but it also carries risks, so let's figure out who really needs it and who should refrain from it.

Advantages of an unlocked bootloader:

• 🚀 Install custom firmware – for example, LineageOS, Pixel Experience or MIUI from other regions (Global/EU instead CN).
• 🔧 Getting root-rights – full control over the system, the ability to remove embedded applications (bloatware) and configure the kernel.
• 🔄 Restore the “brick” – if the smartphone stopped turning on after a failed update, the unlocked bootloader will allow you to reflash it through Fastboot.
• 📱 Testing beta versions of the software - some firmware (for example, MIUI China Developer Requires Unlocking.

Disadvantages and risks:

• ⚠️ Loss of warranty – official Xiaomi service centers refuse to repair devices with unlocked bootloader.
• 🛡️ Malware vulnerability – without bootloader protection, attackers can install spyware on the phone.
• 🔋 Problems with OTA-updates – after unlocking the update “over the air” may not be installed.
• 📉 Decreased stability – unofficial firmware and modifications often contain bugs.

⚠️ Note: On Xiaomi Redmi devices with MediaTek processors (e.g. Redmi Note 11, Redmi) 10C) Unlocking the bootloader can lead to the inability to recover through official tools. Unlike smartphones on Qualcomm Snapdragon, MediaTek does not have universal firmware in the format of Fastboot.

How to check if the bootloader is unlocked on your Xiaomi Redmi

Before you start unlocking, make sure that the bootloader on your Redmi is still locked, and you can do this in two ways:

Method 1: Through Fastboot Mode

1. Turn off the phone.
2. Press the buttons Volume down + Power before the appearance of the Fastboot logo (Android robot with an open stomach).
3. Connect the device to the PC and type in the command line: fastboot oem device-info
4. If you see the line Device unlocked: false, the bootloader is locked.

Method 2: Through the MIUI settings

1. Go to Settings. → The phone.
2. Tap the MIUI version several times to activate the developer mode.
3. Return to the main settings menu and open Additional → for developers.
4. Find the item "Mi Unlock status" if it appears as "Blocked" - unlocking has not been performed.

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If you are connecting to your PC in Fastboot mode, you can download the official Mi Flash Tool package from Xiaomi’s website – it contains all the necessary drivers for Redmi smartphones.

Step-by-step: how to unlock the bootloader on Xiaomi Redmi

The process of unlocking the bootloader on Xiaomi Redmi consists of several steps, it is important to follow them strictly in order to avoid errors. Below is the current guide for 2026.

Step 1: Linking your Mi Account to your device

• 📌 Note: The account must have been created at least 7 days ago, otherwise the Xiaomi server will reject the unlock request.

Step 2: Activate Developer Mode and Booter Binding

• 🔧 Activate Developer Mode (as described in the previous section).
• 🔓 In the Developer Menu, find the Linking Mi Account and bootloader and turn it on.
• 📱 Confirm the action with a password from your Mi Account.

Step 3: Install Mi Unlock Tool and Unlock

1. Download the official Mi Unlock Tool (only from Xiaomi!)
2. Install the program on a Windows PC (on macOS/Linux It only works through a virtual machine).
3. Launch the Mi Unlock Tool and log in with the same account as your phone.
4. Put Redmi in Fastboot mode (Loudness buttons down) + Nutrition).
5. Connect your phone to your PC and press Unlock in the program.
6. Wait until the process is completed (usually takes 1-3 minutes).

Create a Xiaomi account for 7+ days before|Activate the Developer Mode|Link the account to the loader in the settings|Download Mi Unlock Tool from the official website|Prepare. USB-cable (preferably original)|Charge your phone at least 60%-->

⚠️ Note: Some Redmi models (e.g. Redmi Note 12 Pro)+) After unlocking the loader, the settings are reset. DRM, This is why you lose support for Widevine. L1. That means Netflix, Disney,+ Other services will only reproduce content in 480p.

Frequent errors when unlocking the bootloader and how to fix them

Even when following the instructions, users often encounter errors, and let's look at the most common ones and how to fix them.

Error: "Couldn't unlock. Wait for." 72/168/360 hours»

This error means that Xiaomi's server requires you to wait a certain amount of time before trying again.

• 🕒 Mi Account was created less than 7 days ago.
• 📱 The device was unlocked earlier, but then locked again (for example, after firmware was installed). MIUI).
• 🔄 Xiaomi servers are overloaded (often after new firmware releases).

Solution: Wait for the specified time (usually 72 hours for the first unlock) and try again.

Error: "Current account is different from the account info on the device"

This error occurs if:

• 🔑 You logged in to Mi Unlock Tool under a different account than your phone.
• 📱 The account binding to the bootloader was not performed in the settings MIUI.
• 🔄 You reset your phone to factory settings after linking your account.

Solution: Re-link your account in the Developer Menu and use the same account in the Mi Unlock Tool.

Device is locked. Can't receive any command in fastboot.

This is a typ problem for devices with a damaged bootloader or unofficial firmware.

• 🔧 Incorrectly installed drivers Fastboot on PC.
• 📱 The phone is not recognized in Fastboot mode (try another one). USB-cable).
• 🔄 The device has firmware from a third-party developer without the support of official teams.

Solution: Reinstall drivers via the Mi Flash Tool or try another computer.

How to lock the bootloader back (if you need to return the warranty)

If you're selling a phone or want to return it to a service center, you can lock the bootloader back, but this process has nuances.

Method 1: Through the official firmware in Fastboot

1. Download the stable official firmware for your model from the Xiaomi website.
2. Unpack the archive and launch the Mi Flash Tool.
3. Connect your phone in Fastboot mode.
4. In the program, select the option Clean all and lock (this will completely erase the data and block the bootloader).
5. Press Flash and wait until it is completed.

Method 2: Through the Fastboot Command

If you have experience working with ADB/Fastboot, can be used:

fastboot oem lock

However, this method does not work on all Redmi models (for example, the Redmi Note 10 Pro requires pre-unlock critical partitions).

⚠️ Warning: Once the bootloader is locked, all data on the phone will be deleted, and installing custom firmware or root will become impossible without re-unlocking. Anti-Rollback protection may also work if you have been sifting through a newer version. MIUI, more official than.

Xiaomi Redmi models with features of unlocking the bootloader

Not all Redmi smartphones unlock the same way. Some models have unique limitations or require additional actions. The table below provides up-to-date information for popular devices.

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On devices with a MediaTek processor (e.g., Redmi) 10C, Redmi 9A) Unlocking the bootloader often results in loss of the serial number and IMEI. You can only restore them through service utilities like SN Writer Tool that requires skills.

FAQ: Answers to Frequent Questions About Xiaomi Redmi bootloader