How To Unlock Bootloader on Xiaomi 12S Ultra Using Mi Flash Tool? (Guide)

Want to Unlock Bootloader on your Xiaomi 12S Ultra? This is the right place where you will be guided through easy steps to unlock the bootloader without being any risks taken. Here you go! follow up on the complete guide and you will end up unlocking the bootloader on your smartphone. I Promise!

Xiaomi smartphones are one of the top trending phones across the globe nowadays with a vast spectrum of features. The company stands in the top ranking because of its design, performance, and features comprising the advanced hardware components.

Here, all the included steps are authentic. Simply, head over to the main section of this post! to start the unlocking process.


About Bootloader

In simple words, a bootloader is a software that contains a set of instructions to tell the operating system (OS) to boot up these programs whenever the device gets started. Moreover, It also provides a way to boot the phone into recovery mode.

By default, the bootloader on every smartphone is locked by the manufacturer. This is because they want to stay stick to the built-In software installed on the smartphone. As long as the bootloader is locked, you won’t be able to root your device or install TWRP recovery and custom ROMs on your smartphone.

To add custom tweaks and endless customization to your smartphone, you would need to unlock the bootloader on your smartphone. After that, you will be able to experience the new journey with different third-party software available out there.


  • Allow rooting the device.
  • Custom ROMs can be installed.
  • You can Use Custom recovery like TWRP.


  • The warranty of the phone will be void.
  • Security parameters set by the manufacturer will be compromised.

Let’s jump into the main guide to start the unlocking process!

Guide To Unlock Bootloader on Xiaomi 12S Ultra

Make sure, to implement all these pre-requisites below and then head over to the unlocking process.

Note: Unlocking Bootloader process will wipe/erase all the data on your smartphone. Therefore, better to keep complete backup of your data.


The guide is split into four parts as below, which would lead you to unlock the bootloader on your phone.

Step 1: Activate the Developer option to enable USB Debugging and OEM unlocking

Step 2: Link your phone with your Mi account

Step 3: Boot your phone into Fastboot mode

Step 4: Unlock the bootloader using the Mi flash tool

How To Activate Developer Mode To Enable USB Debugging and OEM Unlocking?

Grab your Xiaomi 12S Ultra and tap “Settings”.

Now, Tap on “About Phone – > MIUI Version”.

Tap on the MIUI Version several times until you get a message “you are now a developer”.

After that, access the “Additional system settings” in the main settings area.

When you got into the additional system settings, now go to the developer option and enable both USB debugging and OEM unlocking options.

How To Link Your Phone With Mi Account?

Simply, head over to “Settings->Additional Settings->Developer options”.

In the developer option, tap on the option “Mi Unlock Status”.

Now, tap on the “Add account and device” button located at the bottom.

Now, It will ask for several credentials like phone number and password, etc. Type in the exact phone number that is currently in use on your phone.

After that, It will start verifying your credentials.

Once, verified successfully, you will get a message “Added Successfully, Mi account is linked with this device now”.

How To Boot Xiaomi 12S Ultra into Fastboot Mode?

First of all, enable USB Debugging on your smartphone.

Once you do that, now connect your phone to a computer using the original cable.

Go to the ADB folder that you downloaded, extracted, and installed before from the pre-requisites section.

When you are in the adb folder, now type CMD in the address bar and press the enter key. It will launch the command prompt.

Now, In command prompt, enter the following command and press enter to execute.

adb reboot bootloader

It will successfully boot your phone into fastboot mode.

Now, you will be able to see the fastboot mode startup interface with the Mi bunny logo.

How To Unlock Bootloader on Xiaomi 12S Ultra Using Mi Flash Tool?

First of all, Boot your phone into fastboot mode.

Once you do that, now connect your phone to a computer using the original cable.

Now, launch the Mi Unlock Tool that you have downloaded before from the pre-requisites section.

After that, type in with the right credentials on Mi Unlock Tool. It will start verifying the details further. Once, verification gets completed successfully, you will see a “Connected” message on the Mi Unlock Tool.

Click on the “Unlock” button located below. By doing so, you will get a pop-up, asking for confirmation. Simply, click on “Unlock Anyway”.

Now, the unlocking process will start. Wait for it for several minutes until you get the “Unlocked Successfully” message on the Mi Unlock Tool interface.

Finally, click on the “Reboot phone” button.

That’s it, you have successfully unlocked the bootloader on your smartphone. Now, you can also root your Xiaomi 12S Ultra.

Xiaomi 12S Ultra Specifications


The phone features 6.73 inches LTPO2 AMOLED touchscreen display, providing a resolution of 1440 x 3200 pixels.

Moreover, It runs on Android 12 including MIUI 13 powered by an Octa-Core processor. The internal memory of the phone includes 256/512 GB paired with 8/12 GB of RAM.

It Offers a Quad camera setup on its rear with a 50MP + 48MP + 48MP + TOF 3D primary lens with Leica Lens and Dual-LED flash including other features. In addition, a 32MP secondary lens for selfies is available in front.

The connectivity options available on the phone are WLAN, Bluetooth, GPS, NFC, Infrared port, and USB. It is powered by Li-Po 4860 mAh battery. Officially available in Black, and Dark Green colors.

The price of Xiaomi 12S Ultra starts from 950 EUR.

How To Boot Xiaomi 12S Ultra Into Fastboot Mode?

  • Turn your Phone Off Completely.
  • Now, press and hold Volume Down, and Power buttons simultaneously.
  • Once, you are able to see the Android robot on your phone screen, then release all the buttons.

Now Your Xiaomi 12S Ultra is in Fastboot Mode!

How To Boot Xiaomi 12S Ultra Into Recovery?

  • Turn your Phone Off Completely.
  • Now, press and hold the Volume Up, and Power buttons simultaneously.
  • When the brand logo Pop-ups, now release all the buttons.

Now Your Xiaomi 12S Ultra is in Recovery Mode!

  • Once, you enter the recovery mode, you will see different options around.
  • Simply, follow the below buttons in recovery mode:
  1. Volume Buttons -> To navigate between different options.
  2. Power Button -> To select the option

I am a tech enthusiast and always practice exploring and learning new things. I always like to get knowledge about smartphone hardware and software and try to find out different problems and related solutions.

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