The firmware usually comes as a .zip containing four or five .tar.md5 files: BL (Bootloader), AP (System/System partition), CP (Modem), and CSC (Country/Region specific). Preparation Checklist
The Samsung Galaxy J4 (SM-J400F) Go to product viewer dialog for this item. samsung-j400f-u4-flash-file
Typically corresponds to Android 9 (Pie) or early Android 10 builds for this binary level. The firmware usually comes as a
U4 (Bit 4). You cannot downgrade to a lower binary (e.g., U1, U2, or U3) once your device is on U4. U4 (Bit 4)
U4 flash file refers to the stock firmware for the Bit 4/Binary 4 security revision of this device. Flashing this file is a common method for resolving software issues like bootloops, stuck logos, or performing a factory reset when standard methods fail. Model: SM-J400F (Galaxy J4 2018) Go to product viewer dialog for this item.