Unlike standard user software like Samsung Smart Switch, the Must Tool bypasses conventional APIs (Application Programming Interfaces). It interacts directly with the phone’s eMMC (embedded Multi-Media Card) chip, the UART (Universal Asynchronous Receiver-Transmitter) port, or the Download Mode. This allows technicians to perform tasks that Samsung’s official channels actively block, such as:

: Allows users to load custom binaries, such as TWRP or custom kernels, after unlocking the device's bootloader. 2. The Best Free All-in-One: SamFw Tool

: The tool is often cited for its ability to repair IMEI through the use of a "MUST Account" and user tickets.

The tool is not user-friendly for amateurs. One wrong click (e.g., “Erase EFS” instead of “Backup EFS”) can turn your phone into a tablet without cellular service. But for experienced GSM technicians, it is an indispensable, time-saving utility.

No Samsung service setup is complete without , the proprietary internal flashing software leaked from Samsung’s own service centers. It remains the gold standard on GSM-Forum for resolving soft-bricks and bootloops.

For older Galaxy J, A, and S series (up to S10), the Must Tool can read raw partitions. This allows you to: