How To Unlock the Bootloader of Samsung Galaxy M40

If you are into customization and installing custom ROMs, mod applications, etc, then you should be familiar with the term Bootloader. I always try to get my hands on the latest devices and as soon as I have it, I try to unlock the bootloader of that device. Moreover, if you are a power user like me, then unlocking the bootloader will give you the immense possibilities of installing new custom ROMs like Lineage OS, custom mods, add-ons, etc. In this post, we will look at how to unlock the bootloader of Samsung Galaxy M40.

Samsung released the Galaxy M-series smartphones that were targetted towards the budget market. The Galaxy M40 is the most powerful among the other M-series smartphones i.e. the M10, M20, and the M30. The Galaxy M40 packs some decent specs under the hood and also has a triple camera set-up at the back. It was launched in the previous month and is priced currently at INR19,990. You also get the latest design from Samsung, the Infinity O display at the front of the device.

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So, without any further ado, let us get straight into the article itself;

unlock bootloader of Galaxy M40

Samsung Galaxy M40 Specifications

The Samsung Galaxy M40 is powered by the Qualcomm Snapdragon 675 chipset which is paired with 6GB of RAM which is best in class. The device has the Qualcomm Adreno 612 GPU. Talking about the internal memory, the Galaxy M40 has 128GB of internal storage capacity and you can expand the storage to 512GB via microSD card. In the display department, the device packs a 6.3-inch Full HD+ Infinity O display i.e. a punch-hole LCD panel. It boasts a screen-to-body-ratio of 91.8%. The resolution of the display is 2340×1080 with an aspect ratio of 19.5:9 and 409 PPI. The Galaxy M40 runs on the latest Android 9.0 Pie and over the top has Samsung’s very own OneUI.

Moreover, the device also has the support of Widevine L1 which allows the user to stream online videos via video streaming services at full resolution. It also has the Dolby Atmos 360-degree for surround sound.

In the camera department, at the back, the device has a triple camera setup with 32MP (f/1.7)+ 5MP (f/2.2)+ 8MP (ultra-wide) sensors. In the front, you get a 16MP with f/2.0 aperture. The device also features 4K video recording, slo-mo recording, hyper-lapse, and other features. The Galaxy M40 has a battery capacity of 3500 mAh and supports quick charge as well. You get the fingerprint sensor at the back of the device which is a capacitive sensor. The Galaxy M40 is available in two colors – Midnight Blue and Seawater Blue

How To Unlock the Bootloader of Samsung Galaxy M40

Before we head into the instructions on how to unlock the bootloader of Samsung Galaxy M40, let us take a look at what is bootloader and its advantages;

What is a Bootloader and the Advantages of unlocking it?

As in all of my post which is based on unlocking the bootloader, I give out information to you, so that, you should be aware of what is a bootloader and what are the advantages or the benefits you get after unlocking it.

A bootloader is a piece of software that, will automatically run, every time you starts up your phone or device. Moreover, the bootloader commands the phone, what programs to load in order to make your phone run. Besides, it is very important to have a functioning bootloader as it the one that starts up your device. This is the reason why bootloaders are stored in a stable memory away from your reach on your device. But, there are methods and solution for every smartphone that can help you to unlock your bootloader. However, you need to follow the steps very carefully in order to avoid any permanent damage caused to your device.

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One thing to note is that unlocking your bootloader will void the warranty of your device. So, make sure that you are out of the warranty period or you are sure about what you are doing to your device.


But, there are certain advantages once, you have unlocked the bootloader of your device;

  • You can install any custom ROM of your choice such as Lineage OS, Resurrection Remix ROM, etc.
  • Moreover, you can root your device.
  • You can flash TWRP.

How To Enter the Download/Fastboot Mode on Samsung Galaxy M40 

This is a very important step. If you ever want to customize your device or install custom ROMs or anything, you need to enter the Download mode/Fastboot mode on your smartphone in order to install anything on your device. Moreover, there are two different methods for entering the Download/Fastboot mode on your Samsung Galaxy M40 device;

Method 1:

  • Turn OFF your device.
  • Press and hold the Power button and Volume Down button together.
  • Once you see the Samsung logo, release the buttons.
  • A warning screen will appear on your screen.
  • Press the Volume Down button once.
  • That’s it! Your Samsung Galaxy M40 has booted into the Download/Fastboot mode.

Method 2:

  • Turn OFF your device.
  • Press and hold the Power button and Volume Up button together.
  • Once you see the Samsung logo, release the buttons.
  • Your device will now boot into the recovery mode.
  • You will see different options, navigate and choose the “Reboot to bootloader” option.
  • Press the Power button once, you see the blue bar over the “Reboot to bootloader” option.
  • That’s it! Your Samsung Galaxy M40 has booted into the Download/Fastboot mode.


  • Make Sure your device is charged at least 70%.
  • We would advise you to use the USB cable that came in the box with the device.
  • Make sure you have proper drivers installed for the Samsung Galaxy A70.
  • Enable Developer Options: Go to Settings>> About device. Tap 7 times on Build number to enable Developer options.
  • Enable OEM Unlock and USB debugging options: Settings>>Developer options

Steps to Unlock Bootloader on the Samsung Galaxy M40

As already mentioned above, you need to have an unlocked bootloader in order to install custom ROMs, restricted apps, etc on your device. Moreover, like every other smartphone, the bootloader of the Samsung Galaxy M40 is locked. Please follow the below steps to unlock the bootloader of the device;

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NOTE: Before we begin with the unlocking of bootloader, I would strongly recommend you to create a backup of your device storage and all your files stored on your device. Unlocking of bootloader will wipe off the entire data on your device. Moreover, it is advised to follow the steps mentioned in this post very carefully to avoid permanent damage or bricking of your device. If anything goes wrong the author or are not responsible for it.

  1. Turn OFF your smartphone.
  2. Enter the download mode by any of the two methods as mentioned above.
  3. Once a warning screen is shown on your screen, you will be presented with three options.
  4. Choose the “Device Unlock Mode”
  5. Long press the Volume Up button to unlock the bootloader on your Samsung Galaxy M40.
  6. Now once the process will start, all the data on your device will be erased.
  7. That’s it! You have successfully unlocked the bootloader of your Galaxy M40.

You can now go ahead and root your device and install various MODs, custom ROMs or modify the firmware of your device.


So, there you have it from my side in this post. Hope you have followed the above-mentioned steps and successfully unlocked the bootloader of your Samsung Galaxy M40. Please let us know in the comments section below if you have faced any issues while following the above-mentioned steps and also do report if you come across any link failure as well. The unlocking of bootloader also helps you in installing the custom ROMs like Lineage OS which is one of the most popular custom ROMs out there and moreover, you can unlock the true potential of the Samsung Galaxy M40 by unlocking its bootloader. Until the next post…Cheers!

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