Samsung SM-J400F firmware update — October 2021 security patch. Build: J400FXXU9CUJ4. Includes the latest Android security patches and system stability improvements. Flash using Samsung Odin3.
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Verification & Details
Package Name:
J400FXXU9CUJ4
How to Flash Odin on Samsung Galaxy J4 (SM-J400F)
Please follow these steps carefully to install the J400FXXU9CUJ4/J400FOLM9CUJ4/J400FXXU9CUJ2 update safely. Ensure your device has at least 60% battery.
Download the J400FXXU9CUJ4/J400FOLM9CUJ4/J400FXXU9CUJ2 Recovery ROM (.zip file).
Transfer the file to the internal storage root directory of your Samsung Galaxy J4 (SM-J400F).
Navigate to Settings > About Phone > System Update.
Tap the OS logo 10 times to enable advanced features.
Tap the top-right menu icon and select 'Choose update package'.
Select the downloaded zip file and wait for the automated installation to complete.