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Flashing Guide

[Guide] How to Re-Lock Xiaomi Device Bootloader

2019-01-17 03:23:40
97050 90

Hello, Mi Fan's,
Greeting from MIUI team of Mi Community Bangladesh. What's up?

Occasionally, due to some of our work, bootloader unlock is needed which I said in my unlock tutorial. However, in many cases, the unlocked bootloader should be locked or locked when necessary. If you have been with you then think, "How can the bootloader be locked?"
Today I want to show you, How to Re-Lock your Xiaomi device bootloader.

✒What is Bootloader?
Basically, Bootloader is a code that exists in every operating system in order to run or start. It is a set of instructions package to launch the operating system after the device powered on. Every gadget powered by an operating system contains a bootloader. Android is an open source operating system developed by Google, the bootloader for Android device is changed by a manufacturer to manufacturer.

The main reason is the manufacturing companies makes devices with different types of hardware. For example, you can see the Nexus series, the device hardware is upgraded whenever the new version of the phone is launched. For Apple devices, the difference between the iOS versions makes bootloaders is negotiable.

✒Why Xiaomi or other company locked their device Bootloader?
Manufacturers lock the bootloader of their devices so that only the operating system installed on the device can be used. Not all brand acts in the same way either: some manufacturers release their smartphones with the bootloader already unlocked (to the delight of most computer geeks).

Unlocking the bootloader allows you to install unauthorized software, this operation voids the warranty of your device.

✒Risks of unlocking Mi Devices?
  • By unlocking the device you agree that this may bring changes to some parts of the system. These changes may damage the device.

  • After the device is unlocked, it becomes less secure and more vulnerable to malware attacks, which may lead to the disclosure and loss of your private data.

  • Anyone can flash your device rom easily.
Some features which require high-security level (e.g., Find device, banking apps, added-value services, etc.) will no longer be available.

✒Uses of Bootloader unlock on Android:
The main advantage of unlocking the bootloader on Android is rooting. If you want your Android is rooted or if you want a custom ROM to install the unlocking bootloader is an initial step. However it has advantages, you must be ready to prepare for disadvantages too. Bootloader unlocks can cause the loss of warranty.

However, it is always advisable to use the device in factory settings. Unlocking bootloader is an end customers choice.
(Some parts are collected from Internet and also written by me)
✒How I can check my Xiaomi device bootloader is a lock or unlock?
Go to Settings - About phone - MIUI Version (Tap 7 Times) You can see a message "Now you are a developer" - Additional Settings - Developer Options - Mi Unlock Status.

  • Minimal ADB Fastboot Tool
  • Computer
  • Mi USB Driver

✒Notes: Do anything at your own risk. Before locking your device bootloader, backup your all data. Because your device can be reset/wipe. If you are using China rom on your global device or using global rom on your China device then don't lock your device bootloader. If you can try to lock your device bootloader it can be bricked.

✒Install Minimal ADB Fastboot Tool and open it.
Download Now: Minimal ADB Fastboot (905.17 KB, Downloads: 4320)

✒Turn off your phone and boot into fastboot mode by pressing Volume Down and Power button at the same time.

✒Connect your device with your Computer.

✒Type "fastboot devices" for checking your device is connected with your computer or not.

✒If your device isn't detected on your computer then don't worry. Install Mi USB Driver or update it!
Tutorial: HERE

✒Now type "fastboot oem device-info" this command isn't a nursery. I use this command because some time Mi unlock status showing fake lock.

✒Type "fastboot oem lock" and press enter. This is the main command. After locking your device bootloader it automatically wiped and reboot.

✒If your device isn't automatically rebooted then again type "fastboot oem device-info" and see.

✒Now type "fastboot reboot" and wait for power on.

✒You can also lock your device bootloader from Mi Flashing Tool. Just flash your device rom in a normal way. Only select "clean all and lock" and flash your device latest fastboot rom (ARB fact!)
Tutorial: HERE

Mi Community Bangladesh always wants to share easy and Informative tutorial. If you want to get more beautiful tutorial like this. Keep share, like and comment.

Take care, bye bye...


Number of participants 7 Experience +86 Pack Reason

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2019-01-17 03:23:40
Favorites50 RateRate

Wizard Bunny

MH Imran | from Redmi Note 4


Awesome thread, keep it up
2019-01-17 04:12:21

Master Bunny

M. Ahsan Ullah | from Redmi Note 5


thanks for sharing
2019-01-17 06:31:13

Grand Master Bunny

Mahmud Af Nahin | from Redmi Note 5


amazing thread.... thanks for sharing
2019-01-17 07:04:56

Grand Master Bunny

$huvo | from app


Thanks for the information
2019-01-17 07:32:49
such great thread dear. your all threads are amazing. keep it up.
2019-01-17 12:31:16
Rayhan Hasan
Super Moderator, Mi Community Bangladesh.


Mainul Hasan Rohan Author | from Redmi Note 5


such great thread dear. your all threads are amazing. keep it up.

Thanks dear brother for your support
2019-01-17 13:07:02
Moderator, Mi Community Bangladesh

I ❤️ Mi


Mainul Hasan Rohan Author | from Redmi Note 5


MH Imran
Awesome thread, keep it up

Thank you bro
2019-01-18 12:33:27
Moderator, Mi Community Bangladesh

I ❤️ Mi


Mainul Hasan Rohan Author | from Redmi Note 5


M. Ahsan Ullah
thanks for sharing

welcome brother
2019-01-18 12:33:44
Moderator, Mi Community Bangladesh

I ❤️ Mi


Mainul Hasan Rohan Author | from Redmi Note 5


Mahmud Af Nahin
amazing thread.... thanks for sharing

welcome bro
2019-01-18 12:35:33
Moderator, Mi Community Bangladesh

I ❤️ Mi


Mainul Hasan Rohan Author | from Redmi Note 5


Thanks for the information

welcome brother
2019-01-18 12:35:59
Moderator, Mi Community Bangladesh

I ❤️ Mi
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