Download J400FXXS8CUD4 | Galaxy J4 April 2021 Security Patch

Samsung rolled the latest update for the Galaxy J4 with build number J400FXXS8CUD4 globally. The update brings April 2021 Security Patch update that you can easily get by following this guide.

This latest patch fixes a critical security vulnerability in the System Component that could enable a proximal attacker using a specially crafted transmission to easily harm the device data and security. There is nothing extra added to this update as of now.

Check Software Updates

If in case, you’re not getting the official OTA update notification on your Samsung Galaxy J4 device then you don’t have to worry about it. Just tap on the Settings menu > Software Update > If available for your region, tap on Download and Install.

Make sure to check for the mentioned build number (J400FXXS8CUD4) of the update as well. However, if you have some pending updates available, we’ll recommend you complete installing all the available updates to get a new one in the future.

Download J400FXXS8CUD4 | Galaxy J4 April 2021 Security Patch

Just make sure to connected to a good mobile data or Wi-Fi network for a better downloading speed. Also, keep in mind to have a proper battery backup on your Galaxy J4 (around 50%).

However, if in case, there is no update available on your device, we have an additional method that you can manually follow below. First of all, let’s check out the firmware update info before heading over to the manual firmware installation method.

Firmware Detail:

  • Device Name: Samsung Galaxy J4 (SM-J400F)
  • Region: Global
  • Build Number: J400FXXS8CUD4
  • Android OS Version: Android 10
  • Software Supported: ODIN Tool
  • Android Security Patch Level: 2021-04-01

How to Install April 2021 Security Patch on Galaxy J4

Before jumping into the firmware flashing process, ensure to check out the requirements, and download links. You’ll require to download the ODIN flash tool, firmware flash file, and drivers on your computer. Let’s take a look.


  • This stock firmware (J400FXXS8CUD4) is only applicable to the Samsung Galaxy J4 model.
  • Keep your device charged up to 50% to avoid occasional shut down during the firmware flashing process.
  • A Windows PC/Laptop and a USB Data Cable will require.
  • Make sure to a full data backup before flashing the software on your device.


GetDroidTips will not be responsible for any kind of hardware or software damage to your device while or after you follow this guide. Do the manual flashing process at your own risk. Taking a full data backup is always recommended.


Download Links:

Firmware Installation Guide:

  1. First, download all the necessary files on your PC including the ODIN Flash Tool.
  2. Install and launch the ODIN flash tool > Select the Galaxy J4 stock firmware file according to your region to flash it.
  3. You can check out the full depth firmware flashing guide here: How to Install Samsung Stock Firmware Using Odin Flash Tool
  4. For better visualization support, you can also check out our full-depth video tutorial.

That’s it, guys. We hope you’ve now successfully installed the latest April 2021 security patch on your Samsung Galaxy J4 device. Have some queries? Let us know in the comment section below.

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