Here is Samsung J4 J400f U4 Firmware (stock ROM), Download the latest flash file for Samsung J4 J400f U4 Firmware. Operating system optimization, hang on logo or stuck logo only fix, boot loop fix, This firmware also helps to reset FRP Gmail bypass
There is another way to update your phone software for free, If the warranty on your phone is still running, then take it to the service center.
And if you have your smartphone insured, then contact it
Note: Check the term condition of the insurance company first, because the insurance company does not accept the claim regarding software updates.
Here is the Official Flash Tool For Samsung Smart Phone, (Android And Tizen )
You can update the software of your phone very easily and that too at home
You just have to follow some rules
Charge your phone’s battery 50%
Use a good USB cable
Use the Rear USB Slot of your computer
First Install Samsung USB Driver
Click Double Click And Setup Driver
Press Volume up-Menu-Power key
Now press again volume up key
you can see your Download mode is appear
Now connect the USB cable
Open the tool
Click on AP and select “AP” file
BP and select the “BP” file.
CP and select the “CP” file.
CSC and select the “HOME CSC” file.
Here is the Flashing Tutorial, you can use and flash your device (click here)
For flash combination file you can choss “AP” on
U4 SM-J400F_J400FXXU4BSG1: Google Drive:
Flash Tool And Flashing Driver
Flash Tool For Software Update: Google Drive
Flashing Driver For USB Connectivity: Google Drive
U1 COMBINATION_FAC_FA80_J400FXXU1ARF1: Google Drive
U4 COMBINATION_FAC_FA80_J400FXXU4ASG1: Google Drive
U4 COMBINATION_FAC_FA80_J400FXXU4ASG1: One