Stock Firmware

Galaxy A40 SM-A405FN U3 Firmware – A405FNXXS3BTI3

Galaxy A40 SM-A405FN Binary 3 Firmware

The specific Galaxy A40 SM-A405FN U3 Firmware Download Package comes with a Stock ROM of Galaxy A40 SM-A405FN U3 Security Patch Level 2020-09-01 (1 September 2020). This helps bypass the FRP lock and revert from the root and custom ROM.

Samsung Galaxy A40 SM-A405FN U3 Firmware

There are various reasons to flash “Stock Firmware on Galaxy A40 SM-A405FN U3“. For example, your phone will be stuck or hang on the logo. You want to remove the FRP lock from it.

If you’re going to reset your phone hard and cannot access the recovery menu. But most of the problems that cause flashing stock ROM are below.

The Advantages Of Stock ROM:

  • Flash Stock ROM to solve the boot loop issue
  • Update and Downgrade
  • Unroot or Fix Bugs on the phone
  • To solve the lag or stutter
  • By flashing Stock ROM, you can fix software issues.
  • Revert to stock to get your warranty.


Galaxy A40 SM-A405FN U3 Stock ROM Details:

Model SM-A405FN Binary 3 U3, S3, Bit 3
Region / Country Portugal
Language Multi-Language
Android version Android 10 Q
Operator Clean MEO (without logo, operator apps)
Product code MEO
Build Date Thu, 10 Sep 2020
Security Patch Level 2020-09-01 (1 September 2020)
Size 3.5 GB
Download Google Drive Android File Host

Download Galaxy A40 SM-A405FN U3 Boot.img


boot.img Galaxy A40 SM-A405FN A405FNXXS3BTI3 to root on Magisk without TWRP

Download Google Drive

How To Install Galaxy A40 SM-A405FN U3 Stock Firmware:

Download the Odin and USB Drivers on your PC. Follow the below link to install the firmware using the Odin Flash tool.

How To Flash Samsung Stock Firmware With ODIN

1: Download and Install the Samsung USB Driver on your computer. If a Samsung USB Driver is installed on your computer, Skip this Step.

2: Download and extract the [highlight color=”yellow”]Galaxy A40 SM-A405FN U3 Firmware[/highlight] files on your computer.

3: Now, Switch off your Smartphone.

4: After switching off the phone, you must boot into Download Mode. To boot into download mode.

Press and hold Volume Down, Home and Power button at the same time for 5-8 seconds until download mode is active.

5: In the Download mode, you can see a Warning Yellow Triangle Sign. In this situation, you must press the Volume Up key to continue.

6: Now, Download and open Odin. Then connect your Smartphone to the computer.

7: Once you have connected the Smartphone to the computer, Odin will automatically recognize the device and show the “Added” message at the lower-left panel.

8: Once Odin detects your device, click the PDA button and select the Firmware.tar file.

9: Now, click on the Start button in Odin to begin the Flashing.

10: Flashing usually takes 30-50 seconds to complete on your Phone.

Once the Firmware process is completed, you will be able to see a Green Box with a Pass written on it in Odin. During this process, the Smartphone will reboot automatically.

Once you see the Pass message in Odin, you can disconnect your Device from the computer.

The flashing process will begin and should take about 10–12 minutes. Your device may take some time to reboot, but don’t be alarmed.

When your Galaxy A40 SM-A405FN finally boots up, you should now be running your desired firmware.

If you want to check that the correct firmware is installed, head to Settings –> About Phone –> Software Information. The firmware number is located under the “Baseband version.”


  • Please read and understand the Full Guide before flashing “Galaxy A40 SM-A405FN U3 Firmware.
  • Use these instructions at your own risk. We will not be responsible for everything that happens to your device resulting from using information in this guide.
  • Before flashing, Stock ROM must have a 70–80% charge.

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