How to Unlock Bootloader of Samsung Galaxy A40 (SM-A405FN, SM-A405FM) Easily [Simple Steps]

Today, will share a simple trick with Samsung Galaxy A40 (SM-A405FN, SM-A405FM) owners who are trying to unlock bootloader of their phone. It comes with 7.9mm thickness, 5.9 inches display, plastic frame, corning gorilla glass 3 protection, 16-megapixel camera and 4GB RAM. If you have recently bought Galaxy A40 SM-A405S, then you might be planning to unlock its bootloader. As we know, bootloader is a program that starts whenever phone is turned on. It activates the Android operating system on Galaxy A40 (SM-A405FN, SM-A405FM). Locked bootloader does not allow us to install custom ROM on our phone. It only loads the authorized Android OS with a digital signature. will help you in unlocking Galaxy A40 SM-A405FN bootloader. You will be able to install custom ROM after unlocking bootloader. Previously, I have published the simple instructions for performing a hard reset of Vivo Y20S. Now, I will discuss about the step-by-step tutorial to unlock bootloader of Samsung Galaxy A40.

I am hoping that you will be able to unlock Galaxy A40 (SM-A405FN, SM-A405FM) bootloader without facing any problem after reading the tutorial written in Don’t forget to activate developer options. You must note that your Galaxy A40 (SM-A405FN, SM-A405FM) will lose warranty after the bootloader unlock process. It will let you install Custom ROMs on your phone. You must activate OEM unlock option. Bootloader unlock process will also let you install Magisk on your phone, so you will be able to root your phone after unlocking its bootloader.

If you are planning to install official and unofficial LineageOS custom ROM on Galaxy A40 (SM-A405FN, SM-A405FM), then you must be eagerly waiting to unlock its bootloader. You must save your important documents securely including messages and contacts before unlocking bootloader of Galaxy A40 SM-A405FN, because there is a possibility of losing all documents from your phone during bootloader unlock process.

Below are the steps using which you can unlock bootloader of Galaxy A40 SM-A405FN. will not be responsible if your phone got broken during bootloader unlock process. Galaxy A40 battery must be above 86 percentage before bootloader unlock process. You have to activate developer options before unlocking it.

How to Unlock Bootloader of Samsung Galaxy A40 (SM-A405FN, SM-A405FM) Easily [Simple Steps]

1. Tap “Settings” Menu on Galaxy A40, then you have to tap “About Phone” option.

2. Tap “Software Information” option.

3. Tap “Build number” option several times until you see “You are now a developer” on your phone.

4. Tap “Settings” Menu again.

5. Tap “Developer options”, then activate “USB debugging” and “OEM unlocking” option.

6. Switch off your phone.

7. Download and install USB driver on desktop.

8. Connect your phone with computer via USB cable while pressing Volume down button and Volume up button simultaneously. Your Samsung Galaxy A40 (SM-A405FN, SM-A405FM) will enter into download mode.

9. Long Press Volume up button for a few seconds to enter Device Unlock Mode.

10. Press Volume up button again to unlock bootloader.

You have successfully unlocked bootloader of Galaxy A40 (SM-A405FN, SM-A405FM). If you are experiencing any difficulty while unlocking Galaxy A40 bootloader, then don’t hesitate to share your issue with Please submit your email address and subscribe to get more information regarding Galaxy A40. You must check your email to activate subscription. I’ll help you in unlocking bootloader of your phone.

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