Hello Mi Fans! With queries from lot of users on how to re-lock bootloader here is a simple tutorial that you can perform if you feel that you have installed and discovered your desired ROM and now you want to re-lock your bootloader.

This method of re-locking bootloader will give you quite flexibility because you really don’t need to perform the official flashing.

Prerequisites:

Warning!
My humble request to all of you, please don’t try to lock your bootloader if you have installed TWRP or any custom recovery. It might cause unrecoverable hard brick, as I don’t take any responsibility if you do anything wrong in this process.

Note: If you are on Custom Recovery and you want to re-lock bootloader then you have to first flash Mi Stock Recovery and then use this method.

Now without wasting any time lets get started.

1) Download Minimal ADB and Fastboot and install the .exe file.

2) Install the USB drivers.

How to Enable Developer Mode:
1. Open “Settings”.
2. Go to “About phone”.
3. Tap on “MIUI version” 6-7 times.
4. Hurrah! Now you are a Developer.

How to Check My Current Bootloader Status from My Phone:
1. Open “Settings”.
2. Now from “Settings” go to “Additional settings”.
3. Then go to “Developer options”.
4. Then go to “Mi Unlock status”.
5. From here you can see the current bootloader status of your phone.

Steps to Enable USB Debugging:
1. From “Additional settings” go to “Developer options”.
2. Enable “USB Debugging” from here.
3. Tap on “OK”.

How to Re-lock Bootloader:

1. After enabling USB Debugging Mode boot your device into Fastboot Mode (First switch off your device then boot your device into fastboot mode by pressing Volume Down (-) + Power Button simultaneously or use ADB commands if you’re an advanced user.)
2. Now connect your device to your PC via original Mi USB Cable.
3. Open Minimal ADB and Fastboot from the directory.

4. Now enter the following command in the command prompt window which will show the serial number of your device and status of connection.

fastboot devices

From here also you can check your device status. Just simply enter following command in the command prompt window. If your bootloader is unlocked, you’ll get the following status as shown in the below screenshot.

fastboot oem device-info

5. Now if you want to lock your bootloader again simply type the command below and press ENTER!

fastboot oem lock

Yippee!!! Your bootloader is now locked…

6. Now again enter the following command and see the result

fastboot oem device-info

7. Finally enter the following command to reboot your device

fastboot reboot

That’s all for today, see you again with another interesting tutorial. Hope you all like this post. If you have any queries, you can ask me in the comments section, I will try to answer them…

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