Samsung Galaxy J4 (SM-J400M) - IUS - J400MUBUECWC1 firmware
Samsung Galaxy J4 firmware J400MUBUECWC1 is the Android 10 build for the Samsung Galaxy J4 (model SM-J400M), released by Samsung for Mexico (IUS). It was built on 1 March 2023, carries the 2022-05-01 Android security patch, has changelist 19180804. The package combines system build J400MUBUECWC1 (AP/PDA) with CSC build J400MOWCECVE1 for the IUS region code. SamMobile added this file to the firmware archive on 4 September 2026.
How to flash J400MUBUECWC1 on the Samsung Galaxy J4 (SM-J400M)
We recommend updating through Samsung's own tools: over-the-air (Settings › Software update) or Samsung Smart Switch on a PC. Flash the full firmware with Odin only when you are sure about the risks. A wrong region or a failed flash can brick the device, and SamMobile is not responsible for any damage.
- Download the firmware package above and extract the ZIP. It contains the AP (PDA), BL, CP and CSC files, plus a HOME_CSC file.
- Download and extract Odin on a Windows PC, and install the Samsung USB drivers if the PC does not detect the phone.
- Switch the device off and boot it into Download mode (usually Volume Up + Volume Down while connecting the USB cable, or Volume Down + Bixby + Power on older models).
- Open Odin. The ID:COM box turns blue when the device is connected.
- Load the files in their slots: BL, AP, CP and CSC. Use HOME_CSC to keep your apps and data, CSC to wipe the device.
- Leave Re-Partition unticked and click Start. The device reboots when Odin shows PASS. The first boot after a flash can take a few minutes.
Step-by-step PDFs: 5-file firmware and 1-file firmware.
What the build numbers mean
PDA / AP (J400MUBUECWC1) is the Android system build; its last three characters encode the year, month and revision. CSC (J400MOWCECVE1) is the region and carrier configuration, and CP is the modem firmware. The product code IUS identifies the region or carrier this package was made for (Mexico). Flashing a package for a different product code changes carrier features and can be refused by the bootloader, so pick the one that matches the CSC shown under Settings › About phone › Software information.